The RCA connector is a versatile audio-video interface that employs coaxial signal transmission. The central conductor transmits signals, while the outer ring contact provides grounding functionality. This design enables the RCA connector to simultaneously transmit audio and video signals, including analog video, analog audio, digital audio, and component video signals.
RCA connectors (also known as phono plugs) are widely used for signal transmission in various electronic devices due to their simple structure, strong compatibility, and low cost. They are commonly found in amplifiers, portable music players, televisions, speakers, hi-fi audio equipment, headphones, and other devices.