A hinge is a mechanical device that allows two objects to pivot relative to each other, typically enabling movement like opening and closing. Commonly found in doors, gates, and cabinets, hinges are essential for providing access while maintaining stability. They come in various shapes and sizes, including butt hinges, piano hinges, and pivots. Hinges are usually made from materials like metal or plastic, ensuring durability and strength. The design of a hinge includes a pin that connects two plates, allowing them to rotate around a fixed axis. This simple yet effective mechanism is crucial in everyday items, enhancing functionality and convenience.