MODEM

A modem is a device that lets you connect your computer to a standard telephone line or cable  so that you can transmit, and receive electronically transmitted data.

A USB wireless Modem

It is the keys that unlocks the world of the internet and its world wild web. The goal is to produce a signal that can transmitted easily, and decoded to produce the original digital data. The modem converts a computer’s digital signals into specific frequencies to travel over telephone or cable television lines. At the destination, the receiving modem demodulates the frequencies back into digital data.The word modem is a blend of ‘modulator’ and ‘demodulator’.