A door is a movable barrier that allows people to enter or exit a room or building. It is usually made of wood, metal, or glass and can swing open or closed on hinges. Doors provide privacy and security, keeping unwanted visitors out while allowing those inside to feel safe. They can also be decorative, adding style to a home or office. Doors come in various types, such as sliding doors, French doors, and bi-fold doors. Each type serves a different purpose and can enhance the look of a space. Some doors even have locks for added security, ensuring that only authorized individuals can access certain areas.