Radio

Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves.

They can be received by other antennas connected to a radio receiver; this is the fundamental principle of radio communication.
In addition to communication, radio is used for radar, radio navigation, remote control, remote sensing, and other applications.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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