what is cbs/diff
CBS Corporation (NYSE: CBS, NYSE: CBS.A) is an international mass media conglomerate. CBS operates in five separate segments: Television, Radio, Outdoor, Publishing and Interactive. The CBS television network is ranked first among the major U.S. TV networks by ratings, by Nielsen Media Research. CBS obtains most of its revenue from its entertainment segment. CBS' competitors are also primarily in the television business, including Disney's ABC and Comcast's NBC.