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