Jack (connector)In electronics, a jack is a socket.
In some cases it is arbitrary which of a pair of mating connectors is the plug, and which the socket. See plug.
The term jack occurs in several related terms:
- In the telephone jack of old-style manual telephone exchanges, which is the socket fitting the original 1/4" jack plug, also known as a phone jack.
- In the RJ in RJ11, RJ45 and similar which stands for registered jack, see RJ-XX.
- In the name RCA jack, also known as a phono jack or 1/4" phono jack.