Radio broadcasting

Radio broadcasting transmits audio programs by radio waves from one or more stations to many receivers, for public or subscribed audiences.

Amplitude modulation: A modulation method that encodes information by varying a carrier wave’s amplitude. AM stations vary carrier amplitude to carry audio over radio waves.
Radio communication: The transmission of information using electromagnetic waves at radio frequencies. Broadcasting grew from radio’s earlier use for point-to-point communication.
Electromagnetic spectrum: The full range of electromagnetic radiation, organized by frequency or wavelength. Radio broadcasting occupies a portion of this spectrum shared with other services.
Public broadcasting: Broadcast media services funded or governed to serve the public rather than primarily commercial owners. Public broadcasters use radio to provide programming beyond commercial market priorities.
Podcasting: The distribution of episodic digital audio files or streams, commonly accessed on demand. Podcasts are usually selected on demand, unlike a station’s simultaneous broadcast schedule.
Frequency modulation: A modulation method that encodes information by varying a carrier wave’s frequency. FM stations encode audio as frequency variations, usually with less noise than AM.
Guglielmo Marconi: An Italian inventor and entrepreneur who developed practical wireless telegraphy systems. Marconi’s wireless work helped establish the technology that broadcasting later used.
Radio frequency: The frequency range of electromagnetic waves used for radio communication and related technologies. Broadcast stations are assigned radio frequencies so receivers can distinguish their signals.
Commercial broadcasting: Broadcasting financed chiefly through advertising or other commercial revenue. Commercial radio commonly sells audience attention to advertisers.
Internet radio: Audio programming delivered over internet networks rather than by terrestrial radio transmission. Internet radio resembles station programming but does not depend on radio-wave reception.

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