A communications device used to connect to a network such as the internet.

Modems come in various different forms, the most common is the internal modem which uses a PCI interface to connect to the motherboard. Some motherboards come with modems built-in.

Another type of modem is the external, which, as the name suggests is not inside the case and has it's own power supply. It is connected by way of a cable, which can be serial, USB etc.

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