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 A door is a moveable barrier used to cover an opening. Doors are used widely and are found in walls or partitions of a building or space, furniture such as cupboards, cages, vehicles, and containers.

A door can be opened to give access and closed more or less securely using a combination of latches and locks. (See article Door security).

Doors are nearly universal in buildings of all kinds, allowing passage between the inside and outside, and between internal rooms.  When open, they admit ventilation and light. The door is used to control the physical atmosphere within a space by enclosing it, excluding air drafts, so that interiors may be more effectively heated or cooled.  Doors are significant in preventing the spread of fire. They act as a barrier to noise. (See article Door safety).

They are also used to screen areas of a building for aesthetic purposes, keeping formal and utility areas separate.  Doors also have an aesthetic role in creating an impression of what lies beyond.  Doors are often symbolically endowed with ritual purposes, and the guarding or receiving of the keys to a door, or being granted access to a door can have special significance.[1]Similarly, doors and doorways frequently appear in metaphorical or allegoricalsituations, literature and the arts, often as a portent of change.

Right vs Left handed

Door swings, or “handing”, are always determined from the secure side of the door (ie. the side you use the key on, outside to inside, or public to private).

Left hand hinge (LHH):If the hinges are on the left and the door opens in, it's a left hand door. You push the door with your left hand.

Right hand hinge (RHH): If the hinges are on the right and the door opens in, it's a right hand door. You push the door with your right hand. 

Left hand reverse (LHR): Standing in the house, the hinges are on the right, knob of left, pushing the door to the outside (outswing).

Right hand reverse (RHR): Standing in the house, the hinges are on the left, knob of right, pushing the door to the outside (outswing).

Design and construction styles

Many kinds of doors have specific names, depending on their purpose.  The most common variety of door consists of a single rigid panel that fills the doorway. Many variations on this basic design are possible, such as "double" doors that have two adjacent independent panels hinged on each side of the doorway.

A Dutch door or stable door is divided in half horizontally.  Traditionally the top half can be opened to allow a horse or other animal to be fed, while the bottom half remained closed to keep the animal inside.

Saloon doors are a pair of lightweight swing doors often found in public bars.  Saloon doors, also known as cafe doors, often use double action hinges, which will return the door to the center, regardless of which direction it is opened, due to the double action springs in the doors. Saloon doors that only extend from knee-level to chest-level are known as batwing doors.

A blind door is a door with no visible trim or operable components. It is designed to blend with the adjacent wall in all finishes, and visually to be a part of the wall, a disguised door.

A barn door is a door characteristic of a barn. They are often/always found on barns, and because of a barn's immense size (often) doors are subsequently big for utility.

A French door, also called a French window, is a door that has multiple windows ("lights") set into it for the full length of the door. 

Traditional French doors are assembled from individual small pieces of glass and mullions. These doors are also known as true divided lite[sic] French doors.  French doors made of double-pane glass (on exterior doors for insulation reasons) may have a decorative grille embedded between the panes, or may also be true divided lite French doors. The decorative grille may also be superimposed on top of single pane of glass in the door.

A louvred door has fixed or movable wooden fins (often called slats or louvers) which permit open ventilation whilst preserving privacy and preventing the passage of light to the interior.  Being relatively weak structures, they are most commonly used for wardrobes and drying rooms, where security is of less importance than good ventilation, although a very similar structure is commonly used to form window shutters.

A flush door is a completely smooth door, having plywood or MDF fixed over a light timber frame, the hollow parts of which are often filled with a cardboard core material.  Flush doors are most commonly employed in the interior of a dwelling, although slightly more substantial versions are occasionally used as exterior doors, especially within hotels and other buildings containing many independent dwellings.

A moulded door has the same structure as that of flush door.  The only difference is that the surface material is a moulded skin made of HDF / MDF. It is commonly used as interior doors.

A ledge and brace door is a door made from multiple vertical planks fixed together by two horizontal planks (the ledges) and kept square by a diagonal plank (the brace).

A wicket door is a normal sized door built into a much larger one, such as the gate of a city or castle.

A bifold door is a door unit that has several sections, folding in pairs.  Wood is the most common material, and doors may also be metal or glass.  Bifolds are most commonly made for closets, but may also be used as units between rooms.

A sliding glass door, sometimes called an Arcadia door, is a door made of glass that slides open and sometimes has a screen.

Australian doors are a pair of plywood swinging doors often found in Australian public houses.  These doors are generally red or brown in color and bear a resemblance to the more formal doors found in other British Colonies' public houses.

A false door is a wall decoration that looks like a door.  In ancient Egyptian architecture, this was a common element in a tomb, the false door representing a gate to the afterlife.  They can also be found in the funerary architecture of the desert tribes (e.g., Libyan Ghirza).

Glass door
Glass door