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A '''modem''' (short for "modulator - demodulator") is a generic term for a device which transforms a [[signal]] in one form into another form. The best-known form of modems are those which transform a [[digital]] bit stream into [[analog]] signals.

For many years, from the 1960s until around the end of the century, modems which could be used to transmit data over [[telephone]] lines were the most common. With the rise of [[Internet]] access over [[cable TV]], cable TV modems became common.

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