Television is one of the major mass media of the United States. Ninety-nine percent of American households have at least one television and the majority of households have more than one. There are three basic types of television in the United States: broadcast, or "over-the-air" television, which is freely available to anyone with a TV in the broadcast area, cable television, and satellite television, both of which require a subscription to receive. The United States has a decentralized, market-oriented television system. Unlike many other countries, the United States has no national broadcast programming services. Instead, local media markets have their own television stations, which may be affiliated or owned and operated by a TV network. Stations may sign affiliation agreements with one of the national networks.