Dictionary:

Internet

  (ĭn'tər-nĕt')

An interconnected system of networks that connects computers around the world via the TCP/IP protocol.

A worldwide system of interconnected computer networks. The origins of the Internet can be traced to the creation of ARPANET (Advanced Research Projects Agency Network) as a network of computers under the auspices of the U.S. Department of Defense in 1969. Today, the Internet connects millions of computers around the world in a nonhierarchical manner unprecedented in the history of communications. The Internet is a product of the convergence of media, computers, and telecommunications. It is not merely a technological development but the product of social and political processes, involving both the academic world and the government (the Department of Defense). From its origins in a nonindustrial, noncorporate environment and in a purely scientific culture, it has quickly diffused into the world of commerce.

The Internet is a combination of several media technologies and an electronic version of newspapers, magazines, books, catalogs, bulletin boards, and much more. This versatility gives the Internet its power.

Technological features

The Internet 'Ls technological success depends on its principal communication tools, the Transmission Control Protocol (TCP) and the Internet Protocol (IP). They are referred to frequently as TCP/IP. A protocol is an agreed-upon set of conventions that defines the rules of communication. TCP breaks down and reassembles packets, whereas IP is responsible for ensuring that the packets are sent to the right destination.

Data travels across the Internet through several levels of networks until it reaches its destination. E-mail messages arrive at the mail server (similar to the local post office) from a remote personal computer connected by a modem, or a node on a local-area network. From the server, the messages pass through a router, a special-purpose computer ensuring that each message is sent to its correct destination. A message may pass through several networks to reach its destination. Each network has its own router that determines how best to move the message closer to its destination, taking into account the traffic on the network. A message passes from one network to the next, until it arrives at the destination network, from where it can be sent to the recipient, who has a mailbox on that network. See also Electronic mail; Local-area networks; Wide-area networks.

TCP/IP

TCP/IP is a set of protocols developed to allow cooperating computers to share resources across the networks. The TCP/IP establishes the standards and rules by which messages are sent through the networks. The most important traditional TCP/IP services are file transfer, remote login, and mail transfer.

The file transfer protocol (FTP) allows a user on any computer to get files from another computer, or to send files to another computer. Security is handled by requiring the user to specify a user name and password for the other computer.

The network terminal protocol (TELNET) allows a user to log in on any other computer on the network. The user starts a remote session by specifying a computer to connect to. From that time until the end of the session, anything the user types is sent to the other computer.

Mail transfer allows a user to send messages to users on other computers. Originally, people tended to use only one or two specific computers. They would maintain “mail files” on those machines. The computer mail system is simply a way for a user to add a message to another user's mail file.

Other services have also become important: resource sharing, diskless workstations, computer conferencing, transaction processing, security, multimedia access, and directory services.

TCP is responsible for breaking up the message into datagrams, reassembling the datagrams at the other end, resending anything that gets lost, and putting things back in the right order. IP is responsible for routing individual datagrams. The datagrams are individually identified by a unique sequence number to facilitate reassembly in the correct order. The whole process of transmission is done through the use of routers. Routing is the process by which two communication stations find and use the optimum path across any network of any complexity. Routers must support fragmentation, the ability to subdivide received information into smaller units where this is required to match the underlying network technology. Routers operate by recognizing that a particular network number relates to a specific area within the interconnected networks. They keep track of the numbers throughout the entire process.

Domain Name System

The addressing system on the Internet generates IP addresses, which are usually indicated by numbers such as 128.201.86.290. Since such numbers are difficult to remember, a user-friendly system has been created known as the Domain Name System (DNS). This system provides the mnemonic equivalent of a numeric IP address and further ensures that every site on the Internet has a unique address. For example, an Internet address might appear as crito.uci.edu. If this address is accessed through a Web browser, it is referred to as a URL (Uniform Resource Locator), and the full URL will appear as http://www.crito.uci.edu.

The Domain Name System divides the Internet into a series of component networks called domains that enable e-mail (and other files) to be sent across the entire Internet. Each site attached to the Internet belongs to one of the domains. Universities, for example, belong to the “edu” domain. Other domains are gov (government), com (commercial organizations), mil (military), net (network service providers), and org (nonprofit organizations).

World Wide Web

The World Wide Web (WWW) is based on technology called hypertext. The Web may be thought of as a very large subset of the Internet, consisting of hypertext and hypermedia documents. A hypertext document is a document that has a reference (or link) to another hypertext document, which may be on the same computer or in a different computer that may be located anywhere in the world. Hypermedia is a similar concept except that it provides links to graphic, sound, and video files in addition to text files.

In order for the Web to work, every client must be able to display every document from any server. This is accomplished by imposing a set of standards known as a protocol to govern the way that data are transmitted across the Web. Thus data travel from client to server and back through a protocol known as the HyperText Transfer Protocol (http). In order to access the documents that are transmitted through this protocol, a special program known as a browser is required, which browses the Web. See also World Wide Web.

Commerce on the Internet

Commerce on the Internet is known by a few other names, such as e-business, Etailing (electronic retailing), and e-commerce. The strengths of e-business depend on the strengths of the Internet. Internet commerce is divided into two major segments, business-to-business (B2B) and business-to-consumer (B2C). In each are some companies that have started their businesses on the Internet, and others that have existed previously and are now transitioning into the Internet world. Some products and services, such as books, compact disks (CDs), computer software, and airline tickets, seem to be particularly suited for online business.

Public network of nearly 50,000 networks connecting millions of computers throughout the world. The Internet originally evolved from a U.S. Defense Department experimental network developed in the late 1960s and early 1970s, but since the mid-1990s it has transformed the way people communicate and do business. Anyone with access to a personal computer and a modem can become connected to the Internet and, within certain limits, can send and receive images and data just about anywhere. The Internet does not actually contain information but rather functions as the transport vehicle for information stored in the files or documents contained in the computers it connects. Providing an efficient way to find and share information, the Internet offers services such as e-mail, discussion groups, product information, research capabilities, new software, and the World Wide Web. It has become a viable advertising medium and is increasingly being factored into advertising budgets. In 1998, Internet advertising revenues were reported at $1.92 billion, surpassing reported revenues of outdoor advertising and positioning the Internet well within the role of traditional media outlets. In addition, the Internet technology has resulted in an increase in new types of businesses such as World Wide Web page designers, interactive advertising agencies, and companies that provide secure financial transaction systems. See also world wide web.

Immense collection of networks that are interconnected on a global basis providing services to the general public. These services include the transferring of files among computers, hypertext transfer protocol (HTTP) involving the reading and interpreting of hypertext files (web pages) that contain pictures and sounds, and operating computers from distant locations. Computers use telephone lines, optical fibers, and radio transmissions to connect networks thereby forming Internets. Thus, the Internet is really a super highway along which information travels to the electronic address of its destination computer. Along the way this information may pass through computer network to computer network several times before reaching its electronic address.

1. The Internet can be used to determine life insurance needs and compare costs and types of life insurance policies by referencing the following web sites: www.rightquote.com; www.quickquote.com; and www.accuquote.com

2. Similar analysis of health and disability insurance can be found at these web sites:

www.northcoast.com/unlimited/services_listing/greg_connors/gci.html; www.service.com/answers/health_insurance.html

3. For homeowners, renters, and automobile insurance, the following web sites may be referenced: www.insure.com; www.iiaa.iix.com; www.insuremarket.com

The Internet is a technology and electronic communication system such as the world has never seen before. In fact, some people have said that the Internet is the most important innovation since the development of the printing press.

History of the Internet

The Internet was created as a result of the Cold War. In the mid 1960s it became apparent that there was a need for a bomb-proof electronic communication system. A concept was devised to link computers by cable or wire throughout the country in a distributed system so that if some parts of the country were cut off from other parts, messages could still get through. In the beginning, only the federal government and a few universities were linked because the Internet was basically an emergency military communication system, operated by the Department of Defense's Advanced Research Project Agency (ARPA). The whole operation was referred to as ARPANET.

ARPA was linked to computers at a group of top research universities receiving ARPA funding. The first four universities connected to ARPANET were the University of California-Los Angeles, Stanford University, the University of California-Santa Barbara, and the University of Utah. Thus, the Internet was born. Because of a concept developed by Larry Roberts of ARPA and Glen Kleinrock at UCLA, called packet switching, the Internet was able to become a decentralized system, which would prevent large-scale destruction of any centralized system. The system allowed different types of computers from different manufacturers to send messages to one another. Computers merely transmitted information to one another in a standardized protocol packet. The addressing information in these packets told each computer in the chain where the packet was supposed to go.

As the Internet grew, more capability was added. A program called Telnet allowed remote users to run programs and computers at other sites. The File Transfer Protocol (FTP) allowed users to transfer data files and programs. Gopher programs, developed at the University of Minnesota and named after the university's mascot, allowed menu-driven access to data resources on the Internet. Search engines such as Archie and Wide Area Index Search (WAIS) gave users the ability to search the Internet's numerous libraries and indices. By the 1980s people at universities, research laboratories, private companies, and libraries were aided by a networking revolution. There were more than thirty thousand host computers and modems on the Internet. The fore-runner of the Internet was the Bitnet, which was a network of virtually every major university in the world. E-mail became routine and inexpensive, since the Internet is a parasite using the existing multibillion-dollar telephone networks of the world as its carriers.

In 1972 Ray Tomlinson invented network e-mail, which became possible with the FTP. With e-mail and FTP, the rate at which collaborative work could be conducted between researchers at participating computer science departments was greatly increased. Although it was not realized at the time, the Internet had begun. TCP (Transmission Control Protocol) breaks large amounts of data down into packets of a fixed size, sequentially numbers them to allow reassembly at the recipient's end, and transmits the packets over the Internet using the Internet protocol.

After the invention of e-mail, it wasn't long before mailing lists were invented. This was a technique by which an identical message could be sent automatically to large numbers of people. The Internet continues to grow. In fact, it is estimated that almost 65 million adults go online on the Internet in the United States every month. Presently, no one operates the Internet. Although there are entities that oversee the system, "no one is in charge." This allows for a free transfer and flow of information throughout the world.

In 1984 the National Science Foundation (NSF) developed NSFNET. Later NASA, the National Institutes of Health, and others became involved, and nodes on the Internet were divided into basic varieties that are still used today. The varieties are grouped by the six basic Internet domains of GOV, MIL, EDU, COM, ORG, and NET. The ARPANET itself formally expired in 1989, a victim of its own success, and the use of TCP/IP (Transfer Control Protocol/Internet Protocol) standards for computer networks is now global.

If Internet invention had stopped at this point, we would probably still be using the Internet primarily just for e-mail. However, in 1989 a second miracle occurred. Tim Berners-Lee, a software engineer at the CERN physics lab in Switzerland, developed a set of accepted protocols for the exchange of Internet information, and a consortium with users was formed—thus creating the World Wide Web, the standard language for encoding information. Hypertext Markup Language (HTML) was adopted. Berners-Lee proposed making the idea global to link all documents on the Internet using hypertext. This lets users jump from one document to another through highlighted words. Other web standards, such as URL (Universal Resource Language) addresses on the Web page and HTTP (Hypertext Transfer Protocol), are also Berners-Lee's inventions. Berners-Lee could have been exceedingly rich based on his invention, but he left the fortune-building to others because he "wanted to do the revolution right."

As a result of Berners-Lee's invention, in 1993 a group at the University of Illinois, headed by Mark Andreesen, wrote a graphical application called Mosaic to make use of the Web easier. The next year a few students from that group, including Andreesen, co-founded Netscape after they graduated in May and released the browser for the World Wide Web in November 1994. The World Wide Web is making the Internet easier to use and has brought two giant advantages. Until the Web, the Internet communicated text only, but the Web permits exchange of uncoded graphics, color-coded graphics, color photographs and designs, even video and sound; and it formats typed copy into flexible typographic pages. The Web also permits use of hyperlinks, whereby users can click on certain words or phrases and be shown links to other information or pictures that explain the key words or phrases. As a result of the World Wide Web and Web browsers, it became easy to find information on the Internet and the Web. Various search engines have been developed to index and retrieve this information.

Using the Internet

How does one use the Internet? First, one must have a computer with a connection to the outside world either by a modem connection, a fiber connection such as used in local cable television, or a wireless connection, which is becoming more important. The user is then connected to a system of linked computer networks that encircle the globe, facilitating a wide assortment of data communication services including e-mail, data and program file transfers, newsgroups and chatgroups, as well as graphic images, sound, and video of all kinds. One must choose the right tool to accomplish each task. Thus, one needs to understand the tools to travel this information superhighway.

The Internet is in cyberspace; think of it as a number of planets, each with a unique kind of data program or other type of information service. The only hitch is that each planet's communicating language is different, and one needs several communicating applications and tools. A person is responsible for selecting the proper software program or utility to access what he or she wants. Each program performs a specific task, ranging from providing basic connections, to accessing resources, to preparing e-mail. Common Internet tools include the following:

1. Connection and log-on software. This software provides access to logon to cyber-space. The software sets up the connections to the Internet. This software is usually provided by an Internet service provider.
2. Web browser. Web browsers are usually free. The most common Web browsers are Microsoft's Internet Explorer and Netscape's Navigator. These software programs can usually be downloaded free of charge; they also come with office suites such as Microsoft Office.
3. E-mail manager and editor. To communicate by e-mail users must have an e-mail manager and editor. This editor creates, sends, receives, stores, and organizes your e-mail. Again, many of these e-mail editors can be downloaded free from the Web. One of the most common editors is Eudora. However, office suites usually come with an e-mail manager as well.

A custom connect program starts the procedure for logging on to the Internet using TCP/IP. This is a set of standards and protocols for sharing data between computers and the Internet. Once the protocols have connected, a user must establish his or her identity and authorization to use the Internet services. The Internet service provider used has its own identity on the Internet, and this identity is known as a domain. Domain names, as mentioned previously, are all names listed to the right of the @ sign in the address with an extension such as .com or .edu. The computer then sends and receives data from a host computer over the Internet. A program such as Telnet breaks up the data into packets. The protocols specify how packets should be layered, or packaged. Different layers of packets address a variety of software and hardware needs to send information over different networks and communication links. After a user has properly logged on, he or she can begin using the Internet services.

After a user has completed an on-line work session, he or she must logoff the Internet and, depending on the circumstances, disconnect from the Internet service provider. If a user is using an educational service provider such as a college or other educational institution, he or she probably logs off but does not disconnect, since the service is a virtual service provided to many others at the terminal or computer. If one is using a private commercial service provider, one must be sure that a complete disconnection has been made between the computer and provider or one may still be paying fees.

The Internet has spawned an entirely whole new industry called electronic commerce or sometimes electronic business. Businesses sell to other businesses and to consumers on the Internet using secure Web sites. The current market value of U.S. companies with substantial Internet revenue via e-commerce exceeds $3 trillion and is growing annually. It is estimated that by 2003 over 88 percent of all businesses will derive some of their revenue from e-commerce. It has also been said that the growth of the Internet and e-commerce has been one of the main causes of the robust economy in the United States.

Thus, the Internet has been one of the most productive technologies in recent history. The Internet can transport information from nearly any place on the globe to nearly any other place in seconds. The Internet has changed people's notion of how fast things happen. People say now they "did it in Internet time," meaning something was done in a fraction of the traditional or expected amount of time. The Internet is becoming a major cause of time compression.

Future of the Internet

What does the future hold for the Internet? Predictions are that in the future nearly every Internet-connected device will communicate wirelessly. Low-power radio cells rather than fiber or copper wire, will connect and relay information. Before 2010, more than half of American homes will have at least one low power radio cell connected to Internet bandwidth. The future appears to hold a wireless Internet because of bandwidth problems with cable or wire.

The personal computer will continue to evolve, but there will be a lot of other Internet-smart appliances. Predictions are that there will be Internet wristwatches to match the person with the message. Televisions will, when prompted, record our favorite shows. Various kitchen appliances will start by Internet commands. The personal automobile will also be a mobile personal information store. Automobiles will have internal connectivity and easily carry a very large cache of favorite music, talk, interactive games, and pictures, while passengers will have the option of looking out the window at the real world or looking in the window of their in-car display. Like the explorers who discovered new continents, people are just beginning to discover the full impact of the Internet on information, space, and time.

Bibliography

Anderson, John. "Internet History and Perspective." www2.advisorworks.com. February 28, 2000.

Baylogic. "Net History and Statistics." www.baylogic.com. February 28, 2000.

Berners-Lee, Tim. (1996) "Passing up Fortune-Building 'To Do the Revolution Right'." Investor's Business Daily 13(43)(June 7):1-2.

Reidelbach, Dorothy. (1996). "The Amazing New World Wide Web." Planning for Higher Education 24 (Spring):1-6.

Ricart, Glenn. (2000). "Unofficial Technology Marvel of the Millennium." Educause Review January/February: 38-59.

Rochester, Jack B. (1996). Using Computers and Information. Indianapolis, IN: Macmillan.

[Article by: LLOYD W. BARTHOLOME]

The mother of all networks. First incarnated beginning in 1969 as the ARPANET, a U.S. Department of Defense research testbed. Though it has been widely believed that the goal was to develop a network architecture for military command-and-control that could survive disruptions up to and including nuclear war, this is a myth; in fact, ARPANET was conceived from the start as a way to get most economical use out of then-scarce large-computer resources. Robert Herzfeld, who was director of ARPA at the time, has been at some pains to debunk the “survive-a-nuclear-war” myth, but it seems unkillable.

As originally imagined, ARPANET's major use would have been to support what is now called remote login and more sophisticated forms of distributed computing, but the infant technology of electronic mail quickly grew to dominate actual usage. Universities, research labs and defense contractors early discovered the Internet's potential as a medium of communication between humans and linked up in steadily increasing numbers, connecting together a quirky mix of academics, techies, hippies, SF fans, hackers, and anarchists. The roots of this lexicon lie in those early years.

Over the next quarter-century the Internet evolved in many ways. The typical machine/OS combination moved from DEC PDP-10s and PDP-20s, running TOPS-10 and TOPS-20, to PDP-11s and VAXen and Suns running Unix, and in the 1990s to Unix on Intel microcomputers. The Internet's protocols grew more capable, most notably in the move from NCP/IP to TCP/IP in 1982 and the implementation of Domain Name Service in 1983. It was around this time that people began referring to the collection of interconnected networks with ARPANET at its core as “the Internet”.

The ARPANET had a fairly strict set of participation guidelines -- connected institutions had to be involved with a DOD-related research project. By the mid-80s, many of the organizations clamoring to join didn't fit this profile. In 1986, the National Science Foundation built NSFnet to open up access to its five regional supercomputing centers; NSFnet became the backbone of the Internet, replacing the original ARPANET pipes (which were formally shut down in 1990). Between 1990 and late 1994 the pieces of NSFnet were sold to major telecommunications companies until the Internet backbone had gone completely commercial.

That year, 1994, was also the year the mainstream culture discovered the Internet. Once again, the killer app was not the anticipated one — rather, what caught the public imagination was the hypertext and multimedia features of the World Wide Web. Subsequently the Internet has seen off its only serious challenger (the OSI protocol stack favored by European telecoms monopolies) and is in the process of absorbing into itself many of the proprietary networks built during the second wave of wide-area networking after 1980. By 1996 it had become a commonplace even in mainstream media to predict that a globally-extended Internet would become the key unifying communications technology of the next century. See also the network.

The Internet allows multimedia documents to be moved between any two computers, using an "internetwork" of relaying computers. Multimedia documents can be found by those seeking information using a web browser to "pull" information off the "World Wide Web," or using an e-mail system to "push" information to those currently uninterested or unaware of an issue.

The Internet has been called an "engine of empowerment" that creates healthy "virtual communities." Others, however, say it increases may social and health-related problems, including individual isolation and risky sexual practices by fragmenting relationships and by increasing the anonymous distribution and viewing of pornographic material. These seemingly contradictory outcomes can be reconciled in understanding that the Internet, like any communications technology, amplifies the intentions of its users. It amplifies these intentions by primarily increasing the "reach" of both the sender and receiver, who often share a common interest. As a result, its use may only increase the sharing of information that reinforces and amplifies preexisting life patterns.

(SEE ALSO: Advertising of Unhealthy Products; Information System; Information Technology; Patient Education Media; Self-Help Groups; Social Health)

— MIKE CHIASSON

Biologists often use two terms to describe alternative approaches for conducting experiments. "In vitro" (Latin for "in glass") refers to experiments typically carried out in test tubes with purified biochemicals. "In vivo" ("in life") experiments are performed directly on living organisms. In recent years, the indispensable use of computers and the Internet for genetic and molecular biology research has introduced a new term into the language: "in silico" ("in silicon"), referring to the silicon used to manufacture computer chips. In silico genetics experiments are those that are performed with a computer, often involving analysis of DNA or protein sequences over the Internet.

Geneticists and molecular biologists use the Internet much the same way most people do, communicating data and results through e-mail and discussion groups and sharing information on Web sites, for instance. They also make wide use of powerful Internet-based databases and analytical tools. Researchers are determining the DNA sequences of entire genomes at an ever accelerating pace, and are devising methods for cataloging entire sets of proteins (termed "proteomes") expressed in organisms. The databases to store all this information are growing at an equal pace, and the computer tools to sort through all the data are becoming increasingly sophisticated.

One of the most important Web sites for biological computer analysis (sometimes called bioinformatics) is that of the National Center for Biotechnology Information (NCBI), a part of the National Library of Medicine, which, in turn, is part of the National Institutes of Health. The NCBI Web site hosts DNA and protein sequence databases, protein three-dimensional structure databases, scientific literature databases, and search engines for retrieving files of interest. All of these resources are freely accessible to anyone on the Internet.

Of all the powerful analytical tools available at NCBI, probably the most important and heavily used is a set of computer programs called BLAST, for Basic Local Alignment Search Tool. BLAST can rapidly search many sequence databases to see whether any DNA or protein sequence (a "query sequence," supplied by the user) is similar to other sequences. Since sequence similarity usually suggests that two proteins or DNA molecules are homologous (i.e., that they are evolutionarily related and therefore may have—or encode proteins—with similar functions), discovering a blast match between an unknown protein or nucleic acid sequence and a well-characterized sequence provides an immediate clue about the function of the unknown sequence. An important scientific discovery that, in the past, may have taken many years of in vitro and in vivo analysis to arrive at is now made in a few seconds, with this simple in silico experiment.

Bibliography

Internet Resources

Basic Local Alignment Search Tool. National Center for Biotechnology Information. http://www.ncbi.nlm.nih.gov/BLAST/.

Baxevanis, Andreas D. "The Molecular Biology Database Collection: 2002 Update." Nucleic Acids Research. Oxford University Press. http://www3.oup.co.uk/nar/database/.

ExPASy Molecular Biology Server. Swiss Institute of Bioinformatics. http://ca.expasy.org/.

Virtual Library of Genetics. U.S. Department of Energy. http://www.ornl.gov/TechResources/Human_Genome/genetics.html.

Wellcome Trust Sanger Institute. http://www.sanger.ac.uk/.

WWW Virtual Library: Model Organisms. George Manning. http://ceolas.org/VL/mo/.

—Paul J. Muhlrad

For more information on Internet, visit Britannica.com.

By the late 20th century the internet had become the principal global means of information exchange for individuals as well as multinational corporations. Its origins lay in the internal linking of computers in the US Defense Department in the 1960s and research relating to the control of missiles and bombers. These so-called intranets evolved into the internet (a contraction of ‘internetwork’), a term first used in the 1970s but increasingly widely used from the later 1980s and early 1990s. The networking of computers was first publicly seen at the 1972 International Computer Communication Conference (ICCC), the same year in which early applications of electronic mail were being explored. Other developments followed as efforts intensified to build communications between different groups of researchers or military constituencies. The introduction of the internet as it is recognized today was facilitated by cooperation between US federal agencies and other international organizations. The World Wide Web, a term that came into current usage in the 1990s, was a means of accessing information—text, graphics, sound, visual, moving image, and virtual reality. It became a vehicle for a whole range of electronic (or ‘e-’) services such as shopping, banking, travel, and insurance as well as an increasingly prominent means of personal and business communication, e-mail. Its popularity was closely interlinked with the widespread use of Personal Computers (PCs) and the international proliferation of internet cafés, providing individuals with almost limitless possibilities for communication. The design of websites—increasingly important to corporations, public institutions, and organizations as a means of giving them a competitive edge—has become a highly profitable aspect for graphic, communication, and multimedia design consultancies, although it has become increasingly common for individuals and families to design their own.

The Internet has become an important medium for photographers because it enables images to be transmitted, displayed, and downloaded to computers extremely rapidly worldwide. Photography on the Internet is possible because scanners (and later digital cameras) have been developed to capture images electronically. The first drum scanner was built for the SEAC computer at the US National Bureau of Standards in 1957 by a team led by Russell A. Kirsch (whose other major contribution was to codify the square ‘pixel’ as the basic unit of a digital picture).

The Internet itself grew out of the ARPANET, a network developed under the direction of Dr J. C. R. Licklider of the Advanced Research Projects Agency to link major research centres in the USA. The key to the network's flexibility was its decentralized design, involving routers sending packets of information via all possible connections. The ARPANET was commissioned by the US Department of Defense in 1969 and continued to grow throughout the 1970s. By the 1980s independent service providers and bulletin boards were continuing to multiply, and the Internet Activities Board was founded in 1983. The ARPANET ceased to exist in 1990, by which time it had been superseded by its progeny.

The Internet developed as a visual medium when the first graphical browsers became available. In 1989 Tim Berners-Lee at the Centre Européenne de Recherche Nucléaire (CERN) proposed a web browser that would display webpages consistently across all computers. With the addition of standardized display formats, the World Wide Web (WWW) came into its own from the mid-1990s. Photographs displayed on the Internet are generally shown as JPEG files (invented by the Joint Photographic Experts Group in 1990), GIF files (Graphics Interchange Format, developed by Bob Berry of Compuserve in 1987), and the non-proprietary PNG format (portable network graphics, a free alternative to GIF, developed by Thomas Boutell from 1995). The JPEG is generally used for photographs whilst the GIF is more suitable for geometric shapes and line art. All these formats involve compression, which means that the image's file size is reduced by simplifying its range of colours. Heavy compression results in obvious image degradation, so there is a trade-off between file size and image quality.

The Internet may be used by photographers in several ways. The most obvious is the online gallery, which can showcase one photographer's work or act as a larger repository (e.g. for agencies or picture archives). It presents photographs in a similar way to its physical counterpart, but with the added flexibility of dynamic links and search options to assist viewers. Its layout and style influence its attractiveness to new visitors. The gallery may also be used to sell photographs directly, acting as an online shop. This is useful to freelance photographers wanting to distribute their work, which may be downloaded as secure files or physically mailed to the buyer as prints. Here, the photograph on the website is only a representation of the print, not a substitute for it. The popularity of web-based diaries and writings (weblogs or blogs) has led to collections of images posted as photo journals. Although these are generally by amateurs, the Internet has become a major outlet for online photojournalism. The net speeds delivery of news and photographs, allowing freelancers and small groups to compete with large news agencies. This has broadened the spread of news photography, although some traditional photojournalists fear their skills are being displaced by low-resolution Internet images.

The web's interactive forums also allow the widespread discussion of photographic issues, and interactive reviews of new equipment. This benefits both traditional and digital photographers who want to raise questions or develop their skills. These forums also bring new techniques and concerns to light in a worldwide community of photographers. Other sites teach online photographic courses. The Internet also enables large and rarely seen photographic archives—and document collections like the Talbot Correspondence—to be placed online, often as part of major academic projects. For instance, the 17 million photographs of the Bettmann archive, spanning the 20th century, are to be relocated to a mine north-east of Pittsburgh for preservation underground. Their digitized contents will be made available online with other Corbis holdings. However, the physical inaccessibility of the archive concerns some historians, even though the storage conditions will preserve its actual substance. Another problem relating to this and other large collections is the time it takes to digitize material.

Copyright is a major issue with Internet photography. As with music files, images can be downloaded from websites and used without their owners' permission. The nature of digital data makes copying extremely easy, and although various technologies, including encryption and digital watermarking, are designed to prevent illegal use of images, most can be circumvented. Additionally, older photographs can be scanned and placed in the digital domain. The resulting problems extend from straightforward breach of copyright to more complex issues such as illegal alteration of images. By 2000 this had become both easy and widespread. In 2004 a widely published composite picture ‘showed’ the US presidential candidate John Kerry with Jane Fonda at an anti-Vietnam War protest. It was not only used without the original photographers' permission, but modified for political purposes and posted on websites under the false imprint of Associated Press: a veritable catalogue of infringements. Another notorious 21st-century problem is the creation of pornography at offshore locations and its distribution via the Internet. However, notwithstanding these and other concerns, it seems certain that the Internet will continue to expand rapidly, and probable that, overall, its utility to photographers will continue to outweigh its dangers.

— Nick Lambert

Bibliography

• Mitchell, W. J., The Reconfigured Eye: Visual Truth in the Post-Photographic Era (1992).
• Hoffman, B. (ed.), Exploiting Images and Image Collections in the New Media: Goldmine or Legal Minefield? (1999).
• Andrews, P., The Photographer's Website Manual: The Indispensable Guide to Building and Running a Website (2003)

Arguably the most important communications tool ever created, the Internet connects millions of people to online resources each day. Grown from seeds planted during the Cold War, the roots of the Internet were formed to develop a reliable, national system for communications. Although early pioneers disagree over whether the computer-based communications network was built to withstand nuclear attack, the uneasy tension between the United States and the Soviet Union during the Cold War certainly increased the resolve of the United States to fund and develop relevant scientific and defense-related projects aimed at national security.

Home to many of the preeminent scientists of the time, the Massachusetts Institute of Technology (MIT) served as the birthplace of the Internet. It was there, in Cambridge, Massachusetts, that President Harry Truman's administration formed MIT's Lincoln Laboratories to begin work on the Semi-Automatic Ground Environment. SAGE's primary goal was to develop an air defense system that involved a network of interconnected computers across the United States. The push for advanced technology received an even larger boost in August 1957, when the Soviet Union test fired its first intercontinental ballistic missile and subsequently launched its Sputnik orbiter in October of that same year. Shortly thereafter, President Dwight D. Eisenhower convened a meeting of his Presidential Science Advisory Committee. From that meeting and subsequent congressional testimony on the progress of U.S. defense and missile programs, it became clear that the "science gap" between the two superpowers had widened. Eisenhower sought funding for the Advanced Research Projects Agency (ARPA) late in 1957 and obtained it the following year.

In the early 1960s, the Lincoln Laboratory researchers Lawrence Roberts and Leonard Kleinrock worked on developing a method of digitizing and transmitting information between two computers using a communications method called packet switching. Similar work on systems that used store-and-forward switching was also underway in the late 1950s under the direction of Paul Baran and Donald Davies at the National Physical Laboratory in England. At the heart of both research projects was the development of a communications system in which information would be distributed among all nodes on a network, so that if one or more nodes failed, the entire network would not be disabled. This type of network, in which messages were passed from node to node, with no single node responsible for the end-to-end traffic, was called hot-potato routing.

ARPA's first director, J. C. R. Licklider, moved from Lincoln Laboratory to a small Cambridge, Massachusetts–based consulting firm, Bolt, Beranek, and Newman (BBN), where researchers continued to explore the use of computers as tools of communication. While there, Licklider and his colleagues developed the necessary hardware to connect computers to telephone lines and also researched the collection of data from a wide array of other sources including antennae, submarines, and other real-time sensors. Most of BBN's projects were ARPA supported and sought to achieve ARPA's ultimate goal of helping close the science gap by creating a nationwide network of interconnected computers.

In the summer of 1968, ARPA issued a request for proposals to more than 130 different research centers with the goal of creating a digital network of computers conforming to ARPA's technical specifications. Roberts developed the criteria and served as the chief architect of the network's overall design, which included the deployment of "packet switching technology, using half-second response time, with measurement capability, and continuous operation"—that is, an Internet. Frank Heart and the team of scientists at BBN were awarded the contract in December 1968.Outfitted with specialized minicomputers and interface hardware, BBN set out to connect their "packet switches" or Interface Message Processors

(IMPs), at each ARPA-determined remote location (node), which would then communicate with the host computer at that location. Robert Kahn and Vincent Cerf, with Jon Postel and Charles Kline, developed the software to connect host computers to the IMPs, a host-to-host protocol on how packets would be routed. While America was absorbed in NASA's race to land on the moon in the summer of 1969, BBN air shipped its first IMP computer across the country—no small feat for the time. It arrived safely and was working at the first node, the University of California at Los Angeles, in August 1969.

This phase of the ARPA-BBN project was completed in nine months. Meanwhile, work continued on equipping the second node, the Stanford Research Institute (SRI) in Palo Alto—some four hundred miles away—to the interface message processor. On 1 October 1969 the Stanford node came online and the first message, "LO," was passed that day. BBN continued to progress, installing nodes three and four at the University of California at Santa Barbara (1 November 1969) and the University of Utah (1 December 1969).Only in March of the following year did BBN connect its Cambridge offices to the newly created ARPAnet.

The ARPAnet continued to evolve through the early 1970s with the addition of more diverse data networks such as the University of Hawaii's ALOHAnet packet radio network and the European-based packet satellite network. During this period, the first terminal interface processor (TIP) was introduced to the network, thereby allowing computer terminals to call directly into the ARPAnet using standard telephone lines. In 1972, the first electronic messaging program (e-mail) that supported incoming and outgoing messages was developed. In that same year, a file transfer protocol specification (FTP) to allow for the transmission of data files across the network was designed and tested. With these additions, ARPAnet truly began to fulfill its mission as an open-architecture network, accommodating a variety of different environments and allowing the free sharing of resources.

As the uses of the network grew, more efficient methods for carrying data were needed, forcing an evolution of transmission protocols—the underlying control layer in which the messages flowed—and addressing schemes. After many refinements, TCP/IP (transmission control protocol/Internet protocol) became the de facto standard for communicating on the network. A naming scheme also became necessary and the Domain Name System (DNS) was developed by Paul Mockapetris of the University of Southern California. DNS allowed for the assignment of names to networks and nodes, supplanting the use of numeric addresses. In 1973, Ethernet technology was developed, allowing for the rapid addition of nodes and workstations to the network. With the birth of the personal computer and local area networks (LANs) in the early 1980s, the network grew at a staggering pace.

The federal government funded the network and its infrastructure through 1995.The work of the National Science Foundation (NSF) was instrumental for under-standing the future evolution of the Internet as a true "information superhighway." However, federal funding of the Internet was terminated as a result of the NSF's privatization initiative to encourage commercial network traffic. Control of the large backbones of the network—the set of paths with which local or regional networks connected for long-haul connectivity—was redistributed to private regional network service providers.

The Internet serves as a vital network of communication in the form of e-mail, news groups, and chat. It also provides unparalleled resource sharing and resource discovery through the World Wide Web. At the end of 2001, the Internet continued its phenomenal annual rate of growth of 100 percent. At its start in 1981, the Internet connected just over two hundred researchers and scientists. By the end of 2002, it is estimated that the Internet had the capacity to reach more than six billion people worldwide.

Bibliography

Abbate, Janet. Inventing the Internet. Cambridge, Mass.: MIT Press, 1999.

Hauben, Michael, and Ronda Hauben. Netizens: On the History and Impact of Usenet and the Internet. Los Alamitos, Calif.: IEEE Computer Society Press, 1997.

Quarterman, John S., and Smoot Carl-Mitchell. The Internet Connection: System Connectivity and Configuration. Reading, Mass.: Addison-Wesley, 1994.

Segaller, Stephen. Nerds 2.0.1: A Brief History of the Internet. New York: TV Books, 1998.

The Internet is a vast worldwide conglomeration of linked computer networks. Its roots lie in the mid-twentieth century, with a number of projects by the United States government and the private sector, most notable of which was the computer network created by the Advanced Research Projects Agency (ARPA) of the Department of Defense (DOD) in 1969. Until the early 1990s, the Internet remained largely the province of specialists, including defense personnel and scientists. The creation of browsers, or software that provided a convenient graphical interface between user and machine, revolutionized the medium, and spawned rapid economic growth throughout the 1990s. In addition to the World Wide Web and e-mail, the parts of the Internet most familiar to casual users, the Internet contains a frontier that offers both great promise and great challenges to law and security.

Birth of the Internet

The basis of the Internet is the network, a group of computers linked by communication lines. The distant ancestors of today's networks were highly specialized systems used either by DOD, or by private companies (for example, airlines, which tracked reservations on the SABRE system) during the late 1950s and early 1960s. The development of semiconductor technology in the 1960s enabled the growth of computer activity in general, and networking in particular. Universities and research centers participated in timesharing, whereby multiple users accessed the same system.

ARPANET, which connected time-sharing facilities at research centers, is generally regarded as the first true computer network. It provided a testing-ground for technologies that are still used today: simple mail transfer protocol (SMTP), the system that makes e-mail possible, and file transfer protocol (FTP), for transmitting large messages. To maximize effectiveness, ARPANET broke messages into small pieces, or packets, that could easily be transmitted and reassembled. The technique, known as packet switching, enhanced communication between computers.

The 1970s: TCP/IP. During the 1970s, ARPA (now known as the Defense Advanced Research Projects Agency, or DARPA) continued its efforts to connect its users, but it eventually ran into a dead-end posed by the primitive systems of networking used at the time. Faced with this roadblock, DARPA turned to two computer scientists, Vinton Cerf and Robert Kahn, who developed a design that revolutionized networks.

This was the transmission control protocol (TCP), which, coupled with the related Internet Protocol (IP), provided a mechanism for addressing messages and routing them to their destinations using an open architecture that connected standardized networks. In 1980, DOD adopted TCP/IP as its standard, and required all participants to adopt the protocol as of January 1, 1983. Some observers regard this event as the true birth of the Internet.

The 1980s: civilian agencies get involved. The 1980s saw use of computer networks expand to include civilian agencies. Among these was the National Science Foundation (NSF), which worked with five supercomputing centers spread across the country to create NSFNET, a "backbone" system intended to connect the entire nation. NSF succeeded in linking small local and regional networks to NSFNET. Other civilian participants in computer networks, which began to increasingly overlap with one another, included the Department of Energy and the National Aeronautics and Space Administration (NASA), as well as a number of private companies.

Also during this period, several independent consortiums took on themselves the task of organizing and policing the rapidly growing Internet. Among these were the Internet Engineering Task Force and the Internet Society, both of which are concerned with Internet standards, as well as the Internet Corporation for Assigned Names and Numbers (ICANN). The latter controls policy with regard to the assignment of domain names, including top-level domains such as .com for commercial enterprises, .gov for government offices, .edu for schools, and so on.

The Internet Explosion

The mid-1980s saw the birth of the first commercial computer networks, including Prodigy, Compuserve, and Quantum Computer Services. The first two would eventually recede in significance as larger companies took over the Internet, but the third—founded in 1985 and renamed America Online (AOL) in 1989—would eventually merge with publishing and entertainment conglomerate Time Warner to control a wide span of media. All of that lay far in the future, however, during the mid-1980s, as the few commercial participants developed their first subscriber bases and linked up to NSFNET through the Commercial Internet Exchange (CIX).

A number of technological innovations in the 1980s and early 1990s portended the explosive growth of the Internet that would take place in the next decade. Among these was the development of the personal computer or PC, as well as local area networks (LANs), which linked computers within a single business or location. NSFNET, working with the Corporation for National Research Initiatives, sponsored the first commercial use of e-mail on the Internet. Then, in 1993, new legislation at the federal level permitted the full opening of the NSFNET to commercial users.

The result was much like the opening of lands in the western United States to homesteaders, only the "land" in this case existed in virtual or cyberspace, and instead of wagons, the new settlers used browsers. The first important browser was Mosaic, developed at the University of Illinois using standards created at the European Organization for Nuclear Research (CERN) by Tim Berners-Lee. Thus was born the World Wide Web, which uses hypertext transfer protocol, or HTTP. In this environment, Mosaic—known as Netscape Navigator after the formation of the Netscape Communications Corporation in 1994—and Microsoft's competing Internet Explorer would prove the most useful navigating tools.

Users of the Internet today can still travel to regions beyond the World Wide Web, where they can see what the Internet was like prior to 1993. The most significant surviving portion of this older section is Usenet, a worldwide bulletin board system containing some 14,000 forums or newsgroups. In addition to the Web and Usenet, the Internet includes e-mail (electronic mail), FTP sites (used for transferring pictures and other large files), instant messaging, and other components. At the edges of the Internet are proprietary services such as those accessible only to AOL users, as well as other pay sites. Additionally, company and government intranets (private networks accessible only through a password) lie beyond the periphery of the Internet, though a browser may be used to access both.

By 1988, the size of the Internet was doubling every year, and the advent of browsers made possible an enormous consumer influx. The mid-to late 1990s saw the formation of thousands of Internet service providers (ISPs), through which users gained access to the Internet in exchange for a monthly fee. As competition increased, fees decreased, forcing consolidation of providers. By the beginning of the twenty-first century, major companies such as AOL, AT&T, and Earthlink, along with a few second-tier ISPs, controlled most of the market.

The explosive growth of the Internet itself, coupled with the expanded opportunities for commerce it provided, fueled one of the greatest periods of economic growth in U.S. history, from 1996 to 2000. The economic downturn that began in April, 2000, and continued throughout the early 2000s, however, served as an indicator that the Internet—while it had certainly transformed communications—would not solve all problems.

There were several problems associated with the Internet itself, and simplest among these were the technological challenges involved in moving ever larger amounts of data. By the beginning of the twenty-first century, it became possible to access video and complex graphics using powerful data streams, and computer scientists envisioned technology that would make possible the use of high-resolution video or multiple streams on networks capable of processing 100 gigabits of data a second. To expand the number of available addresses, hitherto limited by the 32-bit IP address standard, the Internet Engineering Task Force in 1998 approved a new 128-bit standard. This made possible so many addresses that every electronic device in the world could have its own unique location in an ever-expanding Internet.

Less simple were some of the challenges associated with human activities. There were cybercrimes, such as hacking or the dissemination of viruses, either of which could be used simply as a form of information-age vandalism, or for extortion. Hacking of financial service sites also offered the opportunity to commit robbery without picking locks, and for this reason many companies adopted secure, encrypted sites. (The latter were designated by the prefix https://, in contrast to the ordinary http://.)

Just as the Internet could be used for education, commerce, and a host of other purposes, it also provided a forum for activities that tested the limits of free speech; extremist political parties and hate groups could operate a Web site. On the other hand, use of the Web to distribute drugs, weapons, or child pornography carried stiff penalties. At the same time, government attempts to restrict or control aspects of the Internet raised concerns over the abrogation of First Amendment rights. The Internet itself was worldwide, beyond the reach of even the U.S. Constitution or any law, and although China's totalitarian regime attempted to restrict citizens' access to it, the network continued to work its way deeper and deeper into the fabric of modern life.

Further Reading

Books

Gillies, James, and R. Cailliau. How the Web Was Born: The Story of the World Wide Web. New York: Oxford University Press, 2000.

Hafner, Katie, and Matthew Lyon. Where Wizards Stay Up Late: The Origins of the Internet. New York: Simon & Schuster, 1996.

Young, Gray, ed. The Internet. New York: H. W. Wilson, 1998.

Electronic

Defense Advanced Research Projects Agency. <http://www.darpa.mil/> (April 14, 2003).

Internet Society. <http://www.isoc.org/> (April 14, 2003).

Webopedia: Online Dictionary for Computer and Internet Terms. <http://www.webopedia.com/> (April 14, 2003).

A worldwide telecommunications network of business, government, and personal computers.

The Internet is a network of computers linking the United States with the rest of the world. Originally developed as a way for U.S. research scientists to communicate with each other, by the mid-1990s the Internet had become a popular form of telecommunication for personal computer users. The dramatic growth in the number of persons using the network heralded the most important change in telecommunications since the introduction of television in the late 1940s. However, the sudden popularity of a new, unregulated communications technology raised many issues for U.S. law.

The Internet, popularly called the Net, was created in 1969 for the U.S. Department of Defense. Funding from the Advanced Research Projects Agency (ARPA) allowed researchers to experiment with methods for computers to communicate with each other. Their creation, the Advanced Research Projects Agency Network (ARPANET), originally linked only four separate computer sites at U.S. universities and research institutes, where it was used primarily by scientists.

In the early 1970s, other countries began to join ARPANET, and within a decade it was widely accessible to researchers, administrators, and students throughout the world. The National Science Foundation (NSF) assumed responsibility for linking these users of ARPANET, which was dismantled in 1990. The NSF Network (NSFNET) now serves as the technical backbone for all Internet communications in the United States.

The Internet grew at a fast pace in the 1990s as the general population discovered the power of the new medium. A significant portion of the Net's content is written text, in the form of both electronic mail (E-mail) and articles posted in an electronic discussion forum known as the Usenet news groups. In the mid-1990s the appearance of the World Wide Web made the Internet even more popular. The Web is a multimedia interface that allows for the transmission of text, pictures, audio, and video together, known as Web pages, which commonly resemble pages in a magazine. Together these various elements have made the Internet a medium for communication and for the retrieval of information on virtually any topic.

The sudden growth of the Internet caught the legal system unprepared. Before 1996 there was little federal legislation on this form of telecommunication. In 1986 Congress passed the Electronic Communications Privacy Act (ECPA) (18 U.S.C.A. § 2701 et seq. [1996]), which made it illegal to read private E-mail. The ECPA extended most of the protection already granted to conventional mail to electronic mail. Just as the post office may not read private letters, neither can the providers of private bulletin boards, on-line services, or Internet access. However, law enforcement agencies can subpoena E-mail in a criminal investigation. The ECPA also permits employers to read their workers' E-mail. This provision was intended to protect companies against industrial spying but has generated lawsuits from employees who objected to the invasion of their privacy. Federal courts, however, have allowed employers to secretly monitor an employee's E-mail on a company-owned computer system, concluding that employees have no reasonable expectation of privacy when they use company E-mail.

Criminal activity on the Internet generally falls into the category of computer crime. It includes so-called hacking, or sneaking into computer systems, stealing account passwords and credit-card numbers, and illegally copying intellectual property. Because personal computers can easily copy information — including everything from software to photographs and books — and the information can be sent anywhere in the world quickly, it has become much more difficult for copyright owners to protect their work.

Public and legislative attention has focused on Internet content, specifically sexually explicit material. The distribution of pornography became a major concern in the 1990s, as private individuals and businesses found an unregulated means of giving away or selling pornographic images. As hard-core and child pornography proliferated, Congress sought to impose restrictions on obscene and indecent content on the Internet.

In 1996 Congress passed the Communications Decency Act (CDA) as part of the Telecommunications Competition and Deregulation Act of 1996 (47 U.S.C.A. § 223(a)(h)). The CDA forbade the dissemination of obscene or indecent material to children through computer networks or other telecommunications media. The act included penalties for knowing violations of up to five years imprisonment and fines of up to $250,000. First Amendment advocates and on-line services immediately brought suit to challenge the act as an unconstitutional restriction on free speech. A special three-judge federal panel in Pennsylvania agreed with these groups, concluding that the law was overly broad because, in attempting to protect children, it would also limit the speech of adults (American Civil Liberties Union v. Reno, 929 F.Supp. 824 [1996]). On June 26, 1997, the Supreme Court affirmed, finding the challenged provisions overbroad (1997 WL 348012).

Another area of legal concern is the issue of libel. In tort law libel and slander occur when the communication of false information about a person injures the person's good name or reputation. Where the traditional media are concerned, it is well settled that libel suits provide both a means of redress for injury and a punitive corrective against sloppiness and malice. Regarding communication on the Internet, however, there is little case law, especially on the key issue of liability.

In suits against newspapers, courts traditionally held publishers liable, along with their reporters, because publishers were presumed to have reviewed the libelous material prior to publication. Because of this legal standard, publishers and editors are generally careful to review anything they publish. However, the Internet is not a body of material carefully reviewed by a publisher, but an unrestricted flood of information. If a libelous or defamatory statement is posted on the Internet, which is essentially owned by no one, the law is uncertain about whether anyone other than the author can be held liable.

Some courts have held that on-line service providers, companies that connect their subscribers to the Internet, should be held liable if they allow their users to post libelous statements on their sites. An on-line provider is thus viewed like a traditional publisher.

Other courts have rejected the publisher analogy and have instead compared Internet service providers to bookstores. Like bookstores, providers are distributors of information and cannot reasonably be expected to review everything they sell. U.S. libel law gives greater protection to bookstores because of this theory (Smith v. California, 361 U.S. 147, 80 S. Ct. 215, 4 L. Ed. 2d 205 [1959]), and some courts have applied it to on-line service providers.

The continued growth of the Internet (twenty-four million subscribers in 1995) has placed enormous burdens on telephone networks. Telephone systems were not designed to handle thousands of Internet connections that may last several hours at a time. Telephone companies, concerned about their capacity to handle the volume of both voice and electronic communication, have proposed changing rate structures and raising rates for Internet users that reflect the higher demands placed on the telephone systems.

See: telecommunications.

Internetworking

Quotes:

"Information on the Internet is subject to the same rules and regulations as conversation at a bar." - George Lundberg

"The difference between e-mail and regular mail is that computers handle e-mail, and computers never decide to come to work one day and shoot all the other computers." - Jamais Cascio

"In Cyberspace, the 1st Amendment is a local ordinance." - John Perry Barlow

"The ides of surfing the net -- I don't know who called it that -- it's more like slogging through the net." - Al Di Guido