Rádio e Televisão de Portugal, S.A. (RTP; Portuguese for Radio and Television of Portugal) is the public service broadcasting organization of Portugal. It operates four television channels (two are on terrestrial) and three national radio channels, as well as several satellite and cable offerings. The company came into effect on 31 March 2004 with the merger of two previously separate companies Radiodifusão Portuguesa (RDP; the radio broadcaster) and Radiotelevisão Portuguesa (television broadcaster).