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Radio refers to the transmission of information without wires. Originally, radio was used as a wireless form of telegraph, broadcasting nothing more than audible clicks. Next, radio was used to transmit sound. In fact, to this day the term radio is usually associated with audio-only transmissions, either in the form of music or the ever-popular talk radio. However, the transmission of video information — in other words, television — is also a form of radio, as are wireless networking, cordless phones, and cellphones.

You learn much more about radio electronics in Book 4, Chapter 3.