Radios have been around for a very long time. They are a way of transmitting a message through the sound waves and them being picked up and converted so they can be heard through speakers to the receiver.
Radios were developed as the wireless telegraphy. Guglielmo Marconi used the radio in commercial, military and marine communication. He also transmitted the first successful message through radio waves in 1902.
The invention of the radio intrigued many people and researchers, but it also sparked arguments as to who actually invented the radio. In most cases they just give the birth of the radio credit to two other inventions, which are the telegraoh and the telephone.
Radios work through the transmission of "radio waves" which are part of the electromagnetic spectrum. These waves can pass pictures, music, speech, and other data through the air invisibly.
In the 1860s, Heinrich Rudoph Hertz, who was a Germand physicist showed how rapid vibrations could be put into the air in the form of waves like heat and light.
The first person to call it the "radio" was Lee Deforest and as the result of some of his work the AM radio was born. The FM was then created from the AM later.
Sources:
"History of Radio." Wikipedia. Wikimedia Foundation, 17 Feb. 2013. Web. 18 Feb. 2013.
http://en.wikipedia.org/wiki/History_of_radio
Bellis, Mary. "The Invention Of Radio." About.com Inventors. N.p., 2013. Web. 18 Feb. 2013.
http://inventors.about.com/od/rstartinventions/a/radio.htm
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