RCA male connector RCA The RCA socket, also known as a phonograph or cinch socket, is a very common type of electrical connection. Created in 1940, it is still found today in most homes. It transmits audio and video signals. The acronym of RCA stands for Radio Corporation of America. Originally, the RCA plug was designed to replace the old telephone plugs of manual telephone exchanges. It was launched on the market at a time when cassettes and VCRs were the stars. RCA connectivity makes it possible to transmit video and audio signals (in mono or stereo) via a cable composed of two strands, according to an analog or digital transmission mode. Inexpensive to produce, it remains compatible with the majority of video formats offered.