A communications satellite, especially one designed to relay television, telephone, or data signals around the Earth.
A 1960s acronym from 'communications satellite,' specifically referring to COMSAT (Communications Satellite Corporation), a pioneering commercial satellite operator founded in 1962.
COMSAT literally revolutionized the world in 1962 when Telstar, the first commercial communications satellite, transmitted a television signal across the Atlantic—before that, transoceanic calls were rare and expensive, but satellites made global instant communication possible for the first time.
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