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Communication is the basic asset of mankind through which he can exchange the information. It gives the idea of what is going around us. We communicate with many people in our daily life. We also need the entertainment medias in our day to day life like TV, radio, browsing, News paper etc which also acts as a source of Communication.

Electronic communication includes TV, radio, Internet etc. Here we need to transmit the information bearing signal from one place to another. To do this we need to strengthen the signal. So that the signal travels for long distances. This is what is called Modulation.

Modulation is the process of superimposing the information contents of a modulating signal on a carrier signal (which is of high frequency) by varying the characteristic of carrier signal according to the modulating signal.