Widely used—and the material of choice for custom and luxury installations—wood doors may be found in designs and finishes to fit virtually any home style, including Colonial, Craftsman, and Victorian among many others.

Sturdy, low-maintenance, and affordable, steel is a leading choice among exterior doors. Most feature an insulating foam core covered by a durable layer of steel, which in turn can be painted to complement any color palette.

Fiberglass doors are a popular choice for installation in entryways. Energy efficient, durable, and affordable, they are available in a variety of styles and finishes, including embossed grain patterns, which emulate the appearance of wood.

Solid doors with no decoration are known as having a flush style. Most commonly used as interior doors, they can be painted, stained, or even covered with wallpaper. 

Also called stile-and-rail doors, panel doors typically come in 4-, 6-, or 8-panel configurations. Whether used in exterior or interior applications, they feature smooth, framed sections that surround deeply embossed panels. Often, one or more panels will feature a window insert, or lite.

Dutch doors are divided horizontally, so the top half can be open while the bottom half remains closed. Dating from the 17th century, this style originally was designed to admit light and air while keeping out wild animals and livestock.

Highly decorative, French, or casement, doors usually come in pairs, with each door featuring a frame around one or more window panels. French doors typically are installed to introduce formal living areas or to provide access to outdoor living areas.

With reclaimed wood furnishings and country decor becoming more popular, barn doors have left the farmyard and entered our homes. Genuine or reproduction, barn doors are often characterized by rough-hewn wood embellished with classic "z" or "x" designs in wrought iron.

These clever space-saving interior doors are designed to disappear into the wall when closed. Ideal for areas with little room for the swing of a standard door with hinges, pocket doors travel on rollers suspended from an overhead track. Often, they have a hollow core and are constructed of lightweight materials to facilitate handling.

Typically constructed of full-size glass panels, patio doors may feature a hinged or sliding construction. Designed to draw the eye, they allow for an easy, attractive transition between indoor and outdoor environments. 

If you're interested in more on doors, consider: 

How To: Select the Right Front Door

10 Eye-Catching Options for Your Front Door

6 Simple & Easy DIY Closet Door Transformations