Patio doors come in a variety of styles, including sliding glass doors, which have at least one door panel that glides smoothly past another door panel horizontally on tracks. Sliding Patio Doors may include more than two panels. Patio doors may also be swinging doors, either single, double, or french swinging doors, to name a few of the many styles. Folding patio doors open up an entire room to the great outdoors by opening accordian style. They can be designed with multiple panels. Adding the variety of glass types available, which can provide clear viewing or obscured viewing for more privacy to the variety of door types, a patio door can be designed to fit any style, taste or budget.