A French-door is a type of door that features two panels that swing open from the center. These doors are often made of glass, allowing natural light to flow into a room while providing a view of the outdoors. They are commonly used as entryways to patios, gardens, or balconies, enhancing the aesthetic appeal of a home. French doors can be designed in various styles, including traditional and modern, and can be made from materials like wood, fiberglass, or aluminum. They are popular in both residential and commercial settings, often serving as a stylish transition between indoor and outdoor spaces.