Channel 4 was established in 1982 and is known for its innovative and diverse programming, which includes news and current affairs, drama, comedy, and documentary series. Channel 4 is also required to meet certain public service broadcasting obligations, such as providing a platform for minority voices and promoting alternative viewpoints. In addition to its main terrestrial television channel, Channel 4 also operates a number of digital channels, including E4, Film4, and 4Music, as well as a video-on-demand service called All 4.