ISPs (Internet Service Providers) acts as Gateway to Network of Networks called Internet for Customers.
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A Campus Area Network (CAN) is used to connect buidlings across campuses of colleges or Universities. CANs' also connect buildings across a military installation as well. A CAN is actually a type of Local Area Network (LAN). It is larger than a LAN but smaller than a Metropolitan Area Network (MAN). A Home Area Network is the network used in an individual home. Home users may have all of their computers in the house connected toghether by CAT-V (twisted pair) cable or by a wireless network (actually called a WLAN - Wireless Local Area Network).
The Internet is a global network of computers. Every computer that is connected to the Internet is considered a part of that network. This means even your home computer. It's all a matter of degrees, you connect to your ISP's network, then your ISP connects to a larger network and so on.
MAN
A specialized network interface card that performs additional functions in addition to creating the interface that goes in between cables. For example, WAN has these cards and it not only creates its own connections but also allows connection to a much larger network.
A network of computers that act as a single unit for purposes of a large company's computing needs is referred to as a "cluster." These are usually in the form of rack-mounted servers that have a Gigabit backbone on its back plane, but this is not necessarily true depending on the hardware used. Larger computer clusters might be connected between racks with fiber optic carrier lines to improve response times between the units within a cluster.