1. A door is a movable structure used to open and close an entrance, typically consisting of a panel that swings on hinges or that slides or spins inside a space. When open, doors admit people, animals, ventilation, and light. The door is used to control the physical atmosphere within a space by enclosing the 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. Many doors are equipped with locking mechanisms to allow entrance to certain people and keep out others

2.  Flush doors are simple interior and exterior doors that feature plain facings on both sides of the construction. While the flush door is more closely associated with function rather than style, this plain sort of door lends itself well to a number of room designs where the desire is to highlight other elements in the space. Doors of this type may have a solid or hollow core.

3.  Panel interior doors are a nice accent piece for many homes. While doors are an important and necessary part of any home, choosing a panel interior door allows you to add a custom look to your rooms. A panel door is typically a heavier weight door than less expensive doors in addition to their specialized look.

4.  Bi-fold doors are often used as alternatives to standard closet doors and sliding door systems. Larger bi-fold door systems are used as room dividers. A typical bi-fold door is actually two panels connected by centralized hinges. Bi-fold doors are usually hung from overhead tracks and suspended by rollers or casters. The innermost door panel has a knob or a pull which allows the user to fold the door panels together. The folded door can then be pushed to the sides of the opening, allowing access to the entire area behind it. Similar sliding doors only allow part of the space to be accessed.

5.  Sliding doors open horizontally by sliding along a track. They are mounted on or suspended from the track and slide in either direction on roller wheels. There are many different types of sliding doors available to consumers today.

6.  Pocket door kits are typically sold according to the size and type of sliding door they will hold. Basic kits are initially divided into two categories based on the type of stud found inside the walls of the home where the pocket door will be mounted.

7.  A door, usually interior, with special hinges or pivots which allow the door to function in both directions.

8.  A Dutch door is a door which consists of two panels divided in half horizontally, allowing the top and bottom of the door to be closed independently. Classically, the bottom panel is left closed, while the top is left open to permit the circulation of light and air. It is very common in rural design and homes which are meant to have a rustic look and feel.

9.  A French door is a door made up of panes or panels of glass. Wooden frames or partitions separate each pane. Glass panes are generally rectangular in shape and make up the majority of the surface of the door. This type of door is typically used as a style element. It is frequently used as a way to bring more natural light into a home, or as a way to divide rooms and set them apart while still maintaining an open feel to the overall space.

10.  Garage doors are often differentiated from each other in two main ways: the materials they are made with and the way the open. While many are familiar with overhead garage doors (multi-panel, solid panel), other types include horizontal sliding doors, and bi-fold. Popular materials for such doors include wood, steel and vinyl.