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abbreviation. noun. Modem is defined as an abbreviation for modulator-demodulator, a device that makes it possible for computers to communicate with one another without being directly connected to each other. An example of a modem is the device used for a computer to communicate with a satellite.
A router routes while a modem modulates! Modem is short for modulator-demodulator. A modem is about line/channel coding - very low level details which most do not care about but that is what really makes the thing fly! It deals with low level encoding etc - A/D conversion, signal processing etc.