A modem is a piece of hardware in which you plug a phone line into to connect to dial up internet access. PCI is simply the cards interface, in your situation it's a card that gets plugged into a PCI slot on your motherboard.
its a PCI (built in if your not tecky) modem basicly Dial-up
PCI Slot
PCI express
Its not mini PCI, its just PCI, they just look mini compared to a PCI-E. It depends on which PCI slot it is, there are tons of different cards that are for PCI. Sound, wireless, modem. Look at the spec's for the motherboard to see what slots you have, then you know what cards you can use.
PCI
it is the PCI Modem, Video Controller and Video Controller(VGA Compatible)
A "PCI Simple Communications Controller" is usually a PCI modem, but it can be other, sometimes unlikely devices, such as an audio or serial device.
The GPRS modem has a much greater bandwidth. It would be better suited to most tasks. However it would depend on what the connection was intended for. The wired modem may provide better reliability and lower ping in some situations.
PCI cards are added to desktop computers for this reason. PCI cards can be almost anything--video, audio, wired internet, Dial-up internet, wireless internet, or even a game controler port.
First of all the internal modem is not in the CPU. The internal moden is either in a PCI slot or intergrated onto the mother board. Second yes, There are many diffrent way to transfer data with out an internal modem
If your not using it then don't worry about it. But motherboards don't come with a modem port. A modem port is on an add on card like a PCI Modem. Take out the old one and insert another and load the drivers from the included CD that is the cheapest way.
Internal modem's PCB connectors comes in two sizes, if its about 5.25in(13.5cm) then its an old(hardly seen anymore) ISA type modem and should be placed on the long black slot, if its short about 3in(80cm) then it a PCI type modem and should be placed on the short white slot. In either of the two, which ever is free, in no particular order, you can safely insert these modem and just make sure it is properly seated.