 Most media outlets now include Fox in what they refer to as the "Big Four" TV networks.The transition to digital broadcasting in 2009 has allowed for television stations to offer additional programming options through digital subchannels, one or more supplementary programming streams to the station's primary channel that are achieved through multiplexing of a station's signal.A number of new commercial networks airing specialty programming such as movies, reruns of classic series and lifestyle programs have been created from companies like Weigel Broadcasting, Luken Communications and even owners of the major networks such as Fox Corporation (through the Fox Entertainment subsidiary), ViacomCBS, The Walt Disney Company (through the Walt Disney Television subsidiary) and Comcast (through the NBCUniversal subsidiary).