Doors may have devices such as knockers or doorbells by which people outside announce their presence. Many doors incorporate locking mechanisms to ensure that only some people can open them (such as with a key). But in other cases (e.g., a vehicle door) the two sides are radically different. In most cases, a door's interior matches its exterior side. The door may be able to move in various ways (at angles away from the doorway/portal, by sliding on a plane parallel to the frame, by folding in angles on a parallel plane, or by spinning along an axis at the center of the frame) to allow or prevent ingress or egress. They are commonly attached by hinges, but can move by other means, such as slides or counterbalancing. Doors are generally made of a material suited to the door's task. Conventionally, it is a panel that fits into the doorway of a building, room, or vehicle. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal). The created opening in the wall is a doorway or portal. A doorĪ door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. For other uses, see Door (disambiguation).
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