A socket wrench is a tool used for tightening or loosening nuts and bolts. It consists of a handle and a detachable socket that fits over the fastener. The socket comes in various sizes to accommodate different fastener sizes, making it versatile for various tasks. To use a socket wrench, you simply select the appropriate socket, attach it to the handle, and turn it in the desired direction. This tool is commonly used in automotive repair, construction, and home maintenance, often in conjunction with other tools like ratchets and torque wrenches for more precise applications.