Description
Modem is the short for Modulator and Demodulator. It is a hardware that use to communicate with other distant computers or more commonly used to connect to the Internet nowadays. 2 modems are required to make a connection and each modem can send and receive data.
Modulation and Demodulation
Modulation is an act of encoding the digital data from a computer into analog signal. Demodulation is an act of decoding the analog signal back to digital data.This article is referred from Wikipedia's Modem article.