Large outdoor structures or signs erected to display advertisements or public messages that can be seen by passing traffic and pedestrians.
Compound of 'bill' (from Old English/Old French, meaning a written notice or advertisement) and 'board' (a flat wooden or metal surface). The term emerged in the late 1800s as advertising became increasingly visual and widespread.
Billboards are one of the oldest forms of 'mass media'—before the internet, if you wanted to reach thousands of people with a single message, you literally had to nail it to a board by the road.
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