Write short notes on Modem

Modem stands for Modulation/Demodulation. Modulation is the process of converting digital signals to analog and Demodulation is the process of converting analog signals to digital i.e. reverse of Modulation. Thus, Modem helps in transmitting and receiving data between devices over a transmission medium like telephone lines, co-axial cables, radio waves, etc. Modem are of two types — internal or built-in modems and external modems.