A socket is a tool that attaches to a socket wrench, ratchet, torque wrench or other turning tool in order to tighten or loosen a fastener such as a nut or bolt by turning it.
Sockets have a recessed square at one end called the ‘drive socket’ that is used to connect the socket to a wrench or other turning tool. The drive socket gets its name because it is the end that is being “driven” (turned) by the turning tool. 

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