In biology:

In computing:

Electrical outlet, an electrical device connected to a power source onto which another device can be plugged or screwed in

an end-point of a bi-directional communication link in the Berkeley sockets API

CPU socket, a physical and electrical specification of how to connect a CPU to a motherboard

Dry socket, a painful opening as a result of the blood not clotting after a tooth is pulled

Eye socket, a region in the skull where the eyes are positioned

Socket wrench, a type of wrench that uses separate, removable sockets to fit different sizes of nuts and bolts

Socket (film), a gay-themed science-fiction indie feature produced by Dark Blue Films and Velvet Candy Entertainment, LLC. (2007)

Internet socket, an end-point in the IP networking protocol

Ball and socket joint

Jack (connector)

Socket: Time Dominator, a video game created by Vic Tokai on the Sega Genesis

In mechanics:

Antenna socket

Socket can refer to: In electronics and electricity:

Socket head screw, a screw (or bolt) with a cylindrical head containing a socket into which the hexagonal ends of an Allan wrench will fit.

In piping and plumbing

An opening in any fitting that matches the outside diameter of a pipe or tube and a further recessed through opening matching the inside diameter of the same pipe or tube.

Tooth socket, a cavity containing a tooth, in those bones that bear teeth. In mammals, tooth sockets are found in the maxilla and the mandible.

Unix domain socket, an end-point in local inter-process communication

A networking utility similar to nc (netcat)