Narrowcasting

v. transmit a program to an intended or limited and specialized audience (opposite of broadcast)

Narrowcasting has traditionally been understood as the dissemination of information (usually by radio or television) to a narrow audience, not to the general public. Some forms of narrowcasting involve directional signals or use of encryption. In the context of out-of-home advertising, this term often refers to the display of content on a digital signage network.
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a term used in reference to cable television in the U.S., where cable TV stations, with specialised interests such as sports, news, weather, movies, etc, allow advertisers great selectivity; that is, advertisers can ìnarrowcastî their messages rather than broadcast them.

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