A press brake is a machine used in manufacturing to bend and shape metal sheets. It works by using a punch and die system, where the punch presses down on the metal sheet placed on the die, creating a bend at a specific angle. This process is essential in producing various metal components for industries like automotive, aerospace, and construction. Press brakes come in different types, including hydraulic and mechanical models, each suited for specific tasks. Operators must be trained to use these machines safely and effectively, ensuring precision in the bending process to meet design specifications and quality standards.