Door is a movable barrier opening, closing or separating an entrance, to a room, cupboard or vehicle. Doors may help control the physical atmosphere, effectively helping in holding the warmth or coolness from escaping from the enclosed area. They are important in setting in a feeling of privacy. Fire rated doors help by preventing fire from spreading, doors also act as a noise blockade by being sound proof. Doors are set on hinges or else slide or spin within the allocated space designed for them. Doors separate rooms and closets and can vary in shape and size, length and width. Doors are usually made of wood, metal, glass etc. depending on the usage. Doors now come in diverse designs, from sliding doors to French doors to rotating doors.