Radio is a technology that allows for the transmission of sound through airwaves. It has been used for entertainment, news broadcasting and emergency communication since its invention in late 19th century.
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Broadcasting: The distribution of audio and/or video signals which transmit programs to an audience.
Frequency Modulation (FM): A method used in radio broadcasting technologies where information (sound) is added to carrier wave by varying its frequency.
Amplitude Modulation (AM): Another method used in radio broadcasting technologies where information (sound) is added to carrier wave by varying its amplitude.