A plug is defined as an electrical connector assembly used to connect electrical appliances to power sources, signal sources, or other devices. It typically consists of metal conductive parts (such as pins and sockets) and an insulated housing. By mating with a socket of corresponding specifications, it enables the transmission of electricity or signals. Its core functions are power transmission and signal transmission.
Headphone jacks are paired with headphone plugs, DC jacks with DC plugs, BNC connectors with BNC plugs, RCA jacks with RCA plugs, and USB ports with USB plugs.