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A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information.

Modem is actually one of the most important hardware devices used in the computer especially for the purpose of networking of the internet. Modems are used to modulate signals of analog types so as to be able to encode the digital information from it. Modems are also used for demodulation of the signals so as to decode the information transmitted.