A socket set is a collection of tools used for tightening or loosening fasteners, such as bolts and nuts. Each socket fits onto a ratchet or a wrench, allowing for easy turning. Socket sets come in various sizes and types, including metric and standard measurements, to accommodate different fastener sizes. Typically, a socket set includes a range of sockets, a ratchet handle, and sometimes additional extensions or adapters. These tools are commonly used in automotive repair, construction, and home improvement projects. A well-organized socket set can make tasks more efficient and help ensure that the right tool is always on hand.