Modem

=Modem= A modem converts the digital data from the computer into a continuous analogue wave-form that the telephone system is designed to deal with (MODulation). The reason for this is that the telephone system was originally designed for the human voice i.e. continuous signals. The modem also converts the analogue signal from the telephone network back into digital data that the computer can understand. (DEModulation). Hence the word MODEM.

(//www.teach-ict.com//)