CBS Corporation operates as a mass media company worldwide. It operates through four segments: Entertainment, Cable Networks, Publishing, and Local Broadcasting. The Entertainment segment distributes a schedule of news and public affairs broadcasts, and sports and entertainment programming; produces, acquires, and distributes programming, including series, specials, news, and public affairs; operates online content networks for information and entertainment; and produces, acquires, and distributes theatrical motion pictures. The Cable Networks segment offers subscription program services, such as original series, theatrical feature films, documentaries, boxing and other sports-related programming, and special events; and owns and operates multiplexed channels. This segment also owns and manages Smithsonian Networks, which operates a channel featuring cultural, historical, scientific, and educational programs; and operates a CBS Sports Network, a 24-hour cable program service that provides college sports and related content. The Publishing segment publishes and distributes adult and children’s consumer books in printed, digital, and audio formats; develops special imprints and publishes titles based on the products; and delivers content and promotes its products on its own Websites and general Internet sites, as well as those linked to individual titles. The Local Broadcasting segment owns 30 broadcast television stations; owns and operates 117 radio stations in 26 U.S. markets and related online properties; and operates local Websites in various U.S. markets, which combine the company's television and radio local media brands online to offer the latest news, traffic, weather, and sports information, as well as local discounts, directories, and reviews for local community. CBS Corporation was founded in 1986 and is headquartered in New York, New York. CBS Corporation operates as a subsidiary of National Amusements, Inc.