A door is a hinged or movable barrier that allows entry into or exit from a space. It typically consists of a panel made of wood, metal, or other materials, which can be opened or closed to control access. Doors serve as physical boundaries and provide security, privacy, and protection against the elements. They come in various designs, sizes, and styles, ranging from simple interior doors to grand entrance doors. A door often symbolizes opportunities, transitions, and new beginnings, representing the gateway between different spaces or stages in life.