A modem (MOdulator/DEModulator) is a device that links your computer with other computers and information services through telephone lines.
 

Explanation:

A modem converts a computer's digital information into audio or sound frequencies that can travel over the telephone line.  The modem on the receiving end converts the audio frequencies back into digital impulses that a computer can understand.  A modem dials a telephone number, answers the call, and controls the speed of the transmission.
 

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Look up "Modem" in the TechEncyclopedia.

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