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Network Advertisement

 A common way for advertisers to display messages is by purchasing airtime from a television network. Advertisers use network schedules to provide national coverage, regional or local spot to reach markets where additional coverage is desired.The three traditional major networks are NBC,ABC, and CBS. Network advertisements help target specific consumers depending on age group or programs they watch.

http://www.adweek.com/tv-video/why-tv-still-most-effective-advertising-medium-165247/