MOdulate/DEModulate A device that modulates digital data from a computer to an analog format that can be sent over telephone lines, then demodulates it back into digital form.
A modem may also refer to a device used for high speed broadband via cable or a dsl connection.
Modems can be a card inserted into a slot on a motherboard, or connected externally through a RJ-11 port or a USB port.
There are also modems that have fax and voice capabilites.
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