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A promo (a shorthand term for promotion) is a form of commercial advertising used in broadcast media, either television or radio, which promotes a program airing on a television or radio station/network to the viewing or listening audience.
The first known promotional products in the United States were commemorative buttons dating back to the election of George Washington in 1789. During the early 19th century, there were some advertising calendars, rulers, and wooden specialties, but there was no organized industry for the creation and distribution of promotional items until later in the 19th century.