A sheet metal bender is a machine used to shape and bend flat sheets of metal into various angles and forms. It operates by applying force to the metal sheet, allowing it to be manipulated into desired shapes for different applications, such as in construction or manufacturing. These machines come in various types, including manual and hydraulic benders, each suited for specific tasks. The process is essential in creating components for products like automobiles, aircraft, and furniture, where precise metal shapes are required for functionality and aesthetics.