Public broadcasting includes radio, television and other electronic media outlets whose primary mission is public service.
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In much of the world, funding comes from the government, especially via annual fees charged on receivers.
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In the United States, public broadcasters may receive some funding from both federal and state sources, but generally most financial support comes from underwriting by foundations and businesses ranging from small shops to corporations, along with audience contributions via pledge drives.
A pledge drive is an extended period of fundraising activities, generally used by public broadcasting stations to increase contributions.
Public broadcasting may be nationally or locally operated, depending on the country and the station.
Other countries have multiple public broadcasting organizations operating regionally or in different languages.
Historically, public broadcasting was once the dominant or only form of broadcasting in many countries.
Commercial broadcasting now also exists in most of these countries; the number of countries with only public broadcasting declined substantially during the latter part of the 20th century.
Commercial broadcasting is the broadcasting of television programs and radio programming by privately owned corporate media, as opposed to state sponsorship.