A television station is a business, organisation or other enterprise, such as an amateur television (ATV) operator, that transmits (broadcasts) content over terrestrial television. A television transmission can occur via analog television signals or, more recently, via digital television signals. Broadcast television systems standards are set by the government, and these vary around the world. Television stations broadcasting over an analog system were typically limited to one television channel, but digital television enables broadcasting via subchannels as well. The term "television station" is normally applied to terrestrial television stations, and not to cable television or satellite television broadcasting.