ITV is the major commercial public service TV network in the United Kingdom. Launched in 1955 under the auspices of the Independent Television Authority (ITA) to provide competition to the BBC, it is also the oldest commercial network in the UK. Since the passing of the Broadcasting Act 1990, its legal name has been Channel 3, the number 3 having no real meaning other than to distinguish it from BBC One, BBC Two and Channel 4. In part, the number 3 was assigned as televisions would usually be tuned so that the regional ITV station would be on the third button, the other stations being allocated to that of the number their name contained.
ITV is to be distinguished from ITV plc, the company that resulted from the merger of Granada plc and Carlton Communications in 2004 and which holds the Channel 3 broadcasting licences in England, Wales, southern Scotland, the Isle of Man and the Channel Islands through its subsidiaries ITV Broadcasting Limited and Channel Television Limited. Similarly ITV1 is the brand used by ITV plc for the Channel 3 service in these areas. Of the companies external to ITV plc, STV and UTV use their own brands in their own respective areas (northern and central Scotland and Northern Ireland).