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Game Development Dictionary
A shorter term for "modulator/demodulator". This is a device which takes data from a computer and turns it into a series of audio pulses which can be sent over a telephone line; on the receiving end, these pulses are "demodulated" into a copy of the original data. Modern internet devices like ADSL and cable no longer use this exact type of technology, but the term "modem" has been expanded to include these devices.