The analog carrier signal is modulated by digital information signal. It’s also considered as digital to analog conversion. . Communication is the basic asset of mankind through which he can exchange the information. It gives the idea of what’s 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. Therefore that the signal travels for long distances. This is what’s called Modulation. Let us study more about the Modulation in this section . .