Broadcasting

Broadcasting distributes audio or audiovisual content from a source to many receivers simultaneously, typically through radio waves, cable, or digital networks.

Modulation: Modulation varies a carrier signal to encode information for transmission. Radio broadcasts encode sound or pictures by varying a carrier wave.
Guglielmo Marconi: An Italian inventor and entrepreneur who developed practical wireless telegraphy systems. His wireless work helped establish the technology later used for radio broadcasting.
Public broadcasting: Broadcast media funded or governed to serve public-interest goals rather than maximize commercial returns. It uses broadcast reach to provide education, news, and cultural programming.
Unicast: Network communication in which a sender transmits data to one specific receiver. Unlike broadcasting, unicast directs a separate stream to each destination.
Radio transmitter: A radio transmitter generates and sends radio-frequency signals carrying information. It converts a broadcast signal into radio waves that can travel to receivers.
Reginald Fessenden: A Canadian inventor who pioneered continuous-wave radio transmission and voice broadcasting. His early voice and music transmissions demonstrated radio's capacity for programs.
Commercial broadcasting: Broadcasting funded primarily by advertising, sponsorship, or subscription revenue. Advertising-supported stations finance programming by reaching large audiences.
Multicast: Network delivery in which data is sent to a selected group of receivers. Multicast targets a defined audience rather than every receiver in reach.
Broadcasting antenna: A broadcasting antenna converts electrical signals into radio waves or captures incoming radio waves. Its height and design shape the area a terrestrial broadcast can reach.
KDKA: A Pittsburgh radio station that began regular commercial broadcasting in 1920. Its election-night coverage became an early landmark in scheduled radio service.

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