A Socket
- (mechanics) An opening into which a plug or other connecting part is designed to fit (e.g. a light bulb socket).Synonym: jack

- (anatomy) A hollow into a bone which a part fits, such as an eye, or another bone, in the case of a joint.
- (computing) One endpoint of a two-way communication link, used for interprocess communication across a network.
- (computing) One endpoint of a two-way named pipe on Unix and Unix-like systems, used for interprocess communication.
- A hollow tool for grasping and lifting tools dropped in a well-boring.
- The hollow of a candlestick.
- A steel apparatus attached to a saddle to protect the thighs and legs.