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Media forms delivered over the air or by wire on a schedule set by the broadcaster rather than the audience. Belongs here: radio and television as media forms. Does not belong here: streaming video and other on-demand media, grouped under digital and interactive media, or the broadcast hardware itself, which belongs to the technology type.

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Comparison
Era of Emergence
1920 1
All Broadcast
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Sources
1. Wikipedia
Wikimedia Foundation
Broadcasting (Wikipedia)
Wikipedia: Broadcasting, lead section
Quote, Wikipedia: Broadcasting, lead section
Broadcasting began with AM radio, which became popular around 1920 with the spread of vacuum tube radio transmitters and receivers.
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