page_title: Door
section_title: Applications
hierarchical_section_title: Door / Applications
caption_attribution_description: Lëtzebuergesch: 17, rue Nicolas Welter zu Miersch.
context_page_description: A door is a hinged or otherwise movable barrier that allows ingress into and egress from an enclosure. The opening in the wall is a doorway or portal. A door's essential and primary purpose is to provide security by controlling access to the doorway. Conventionally, it is a panel that fits into the portal of a building, room, or vehicle. Doors are generally made of a material suited to the door's task. Doors are commonly attached by hinges, but can move by other means, such as slides or counterbalancing.
  The door may be moved in various ways to allow or prevent ingress or egress. In most cases, a door's interior matches its exterior side. But in other cases the two sides are radically different.
  Doors often incorporate locking mechanisms to ensure that only some people can open them. Doors can have devices such as knockers or doorbells by which people outside announce their presence.
context_section_description: Architectural doors have numerous general and specialized uses. Doors are generally used to separate interior spaces (closets, rooms, etc.) for convenience, privacy, safety, and security reasons. Doors are also used to secure passages into a building from the exterior, for reasons of climate control and safety.
  Doors also are applied in more specialized cases:
  A Blast-proof door is constructed to allow access to a structure as well as to provide protection from the force of explosions.
  A garden door is any door that opens to a backyard or garden. This term is often used specifically for French windows, double French doors (with lites instead of panels), in place of a sliding glass door. The term also may refer to what is known as patio doors.
  A jib door is a concealed door, whose surface reflects the moldings and finishes of the wall. These were used in historic English houses, mainly as servants' doors.
  A pet door (also known as a cat flap or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened. It may be simply covered by a rubber flap, or it may be an actual door hinged on the top that the pet can push through. Pet doors may be mounted in a sliding glass door as a new (permanent or temporary) panel. Pet doors may be unidirectional, only allowing pets to exit. Additionally, pet doors may be electronic, only allowing animals with a special electronic tag to enter.
  A trapdoor is a door that is oriented horizontally in a ceiling or floor, often accessed via a ladder.
  A water door or water entrance, such as those used in Venice, Italy, is a door leading from a building built on the water, such as a canal, to the water itself where, for example, one may enter or exit a private boat or water taxi.
caption: Transparent awning in Luxembourg
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