Panel doors are a type of door constructed using multiple panels, typically made from wood or composite materials. These panels can be flat or raised, creating a decorative appearance. The design allows for a sturdy structure while also providing aesthetic appeal, making them popular in both residential and commercial settings. The construction of panel doors often involves a frame-and-panel system, where the panels fit into a frame. This design helps accommodate changes in temperature and humidity, reducing the risk of warping. Panel doors can be found in various styles, including traditional, modern, and rustic, catering to diverse architectural preferences.