Door

A door is a hard, flat object a person can open and close so that person can go into a room or other place. It is found in houses and other buildings. Doors are also found in cars and cages.

The reasons for a door are:

for people, animals, and objects to go through; some doors are for emergencies only (emergency exit)
to keep cold or hot air outside (or inside, such as the door on a refrigerator)
so that people cannot see or hear what happens on the other side (privacy and stopping noise)
so that people do not fall out of the car or other vehicle
so a person can decide who to let in—many doors have a lock

Types of doors

A revolving door is a group of doors that turn in a circle as a person pushes one. The person can go through, but wind and rain cannot get in.

A blind door is a fake door that is really part of the wall. People use them to make a room look nice.

An up-and-over door is often used in garages. Instead of hinges, it rolls up on rails so that it stays above the opening.

A fire door is a door that does not let fire go through. They are usually made of heavy steel.

A doggie door is a small door for dogs or other small pets. They are usually on the bottom of people-sized doors.

200-year-old door in Tajhat Palace, Rangpur, Bangladesh
200-year-old wooden door in Tajhat Landlord's Palace

Door Media

Zeichnung einer halboffenen Tür
Roman folding doors at Pompeii, from the first century AD, similar to Neoclassical doors from the 19th century
Roman wall painting of an ornate door, in the Villa Boscoreale (Italy), from the first century AD
Glass door decorated with Art Nouveau elements, from the Singer House (Saint Petersburg, Russia)
Door of the Florence Baptistery called The Gates of Paradise, 1425–1452, gilded bronze, height: 5.2 m
Entrance of the Kunsthistorisches Museum (Vienna, Austria)
The main types of door mechanisms
Sectional doors for industry
Transparent awning in Luxembourg, above a door
Parts of a panel or glazed door