Radio is the wireless transmission: telegraphy or telephony that enables the broadcasting of speeches.
(been paraphrased, used sources as http://www.answers.com/topic/radio and http://dictionary.reference.com/browse/radio%20)
The audience of radio can be varied according to the purpose what they are seeking for in radio. General population has a lot of choices since radio provides music, issues (news), traffics (on-road situation), and advertisements. Radio's characteristics are first of all, it can give out regional information. Secondly, it is interactive, hence, more personal. Moreover, radio has day-long programs.
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