NBCUniversal Media, LLC, abbreviated as NBCU, is an American multinational mass media and entertainment conglomerate that is a subsidiary of Comcast and headquartered at 30 Rockefeller Plaza in Midtown Manhattan in New York City. It is mostly involved in the media and entertainment industry, named for its two most significant divisions: the National Broadcasting Company (NBC)—one of the United States' Big Three television networks—and Universal Pictures, one of the major Hollywood film studios.