ITV is a commercial television channel in the United Kingdom. Previously a network of separate regional television channels, ITV currently operates in England, Wales, Scotland and the Channel Islands. ITV is the biggest and most popular commercial television channel in the United Kingdom. ITV and its predecessor channels have contended with BBC One for the status of the UK’s most watched television channel since the 1950s. However, in line with other terrestrial channels, ITV’s audience share has fallen in the era of multi-channel television.