Among many type of doors, exterior doors could be the most various door ever. There are many carves and decoration at the door that makes it looks more beautiful. We call it exterior because this door is used outdoor or it is not used under the roof. So, if it is not used to divide rooms, what is it used for?
Exterior door is different to the interior door. If interior door is designed to divide rooms inside house, the exterior door is often used to divide garden. Exterior house is also used for the extra protection to the house. For example, we use this patio doors to protect the terrace of the house. So the guest should pass two doors before stepping into the living room.
Patio door is a type of door that is used at garden. It looks like an accessory to make beautiful the garden. There are other garden furniture like table and bench. The main point of the patio door is not the strength like wood doors, but the look. It is often placed between bushes or plant fences. So its impression is merged with the garden. That is why door is also used at the garden.