In Argentina, for most of the history of broadcasting, there were only five major commercial national terrestrial networks. Until 2018, these were Televisión Pública, El Nueve, El Trece, Telefe and América. Since 2018, Net TV became the sixth major commercial network, with Televisión Pública being the national public television service. Local media markets have their own television stations, which may either be affiliated with or owned and operated by a television network. Stations may sign affiliation agreements with one of the national networks for the local rights to carry their programming.