Door

A door is a movable barrier that allows people to enter or exit a space, such as a room, building, or vehicle. It typically consists of a flat panel attached by hinges, enabling it to swing open or closed. Doors serve important functions like providing security, privacy, and controlling airflow, light, and sound. They can be made from various materials like wood, metal, or glass, and often include handles or locks for operation and safety. In essence, a door is a functional point of access that balances convenience with protection.