A rivet is a mechanical fastener used to join two or more materials together, typically made of metal. It consists of a cylindrical shaft with a head on one end. When installed, the shaft is inserted through pre-drilled holes in the materials, and the other end is deformed to create a second head, securing the pieces in place. Rivets are commonly used in construction, manufacturing, and automotive industries. Rivets come in various types, including solid, blind, and tubular rivets, each designed for specific applications. They are favored for their strength and durability, making them ideal for structures like bridges and aircraft, where reliability is crucial.