Radio owes its development to two other inventions, the telegraph and the telephone, all three technologies are closely related. Radio technology began as "wireless telegraphy".
Radio can refer to either the electronic appliance that we listen with
or the content listened to. However, it all started with the discovery
of "radio waves" - electromagnetic waves that have the capacity to
transmit music, speech, pictures and other data invisibly through the
air. Many devices work by using electromagnetic waves including: radio,
microwaves, cordless phones, remote controlled toys, television
broadcasts, and more.
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