Radio is the transmission of information by means of electromagnetic signals. During the time period when radio was invented, it was used to send telegraphic messages by both the army and navy. Later only it was widely used for broadcasting purposes. Till the invention of television, radio was the popular mass medium for news and entertainment. The quality of the voice is higher for FM broadcast radio when compared to AM broadcast radio. Amateur radio or ham radio enables people to transmit the radio signals. The ham radios have proved useful many a times. Lately satellite digital radio offers the best way to enjoy music broadcasts.