CBS is sometimes referred to as the "Eye Network", in reference to the company's iconic logo, in use since 1951. It has also been called the "Tiffany Network", alluding to the perceived high quality of CBS programming during the tenure of William S. Paley. It can also refer to some of CBS's first demonstrations of color television, which were held in a former Tiffany & Co.building in New York City in 1950.
The network has its origins in United Independent Broadcasters Inc., a collection of 16 radio stations that was purchased by Paley in 1928 and renamed the Columbia Broadcasting System. Under Paley's guidance, CBS would first become one of the largest radio networks in the United States, and eventually one of the Big Three American broadcast television networks. In 1974, CBS dropped its former full name and became known simply as CBS, Inc. The Westinghouse Electric Corporation acquired the network in 1995, renamed its corporate entity to the current CBS Broadcasting, Inc. in 1997, and eventually adopted the name of the company it had acquired to become CBS Corporation. In 2000, CBS came under the control of Viacom, which was formed as a spin-off of CBS in 1971. In late 2005, Viacom split itself into two separate companies and re-established CBS Corporation – through the spin-off of its broadcast television, radio, and select cable television and non-broadcasting assets – with the CBS television network at its core. CBS Corporation is controlled by Sumner Redstonethrough National Amusements, which also controls the current Viacom.
CBS formerly operated the CBS Radio network until 2017, when they brought and merged their radio division with Entercom. Prior to then, CBS Radio mainly provided news and features content for its portfolio owned-and-operated radio stations in large and mid-sized markets, and affiliated radio stations in various other markets. Despite CBS owning a 72% stake, CBS O&O stations no longer owns any radio stations, though CBS still provides its news to its radio affiliates and the new owners of their former radio stations. The television network has more than 240 owned-and-operated and affiliated television stations throughout the United States.