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Modem: this is a small piece of equipment that translates the digital language your computer speaks into the analogue language used by the telephone, thereby enabling you to send and receive data. The name is a shortened form of modulate-demodulate (translation to analogue-translation to digital). Most new computers are sold with a modem already installed. If yours was not, you will need to do a bit of research into the latest models, to get the best speed and compatibility.