A socket set is a collection of tools used for tightening and loosening nuts and bolts. It typically includes a variety of sockets, ratchets, and extensions, as well as other accessories such as hex keys, screwdrivers, and wrenches. Socket sets are essential for any DIYer
From Wikipedia
A socket wrench is a type of spanner that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.