French doors are a type of door that consists of two panels, usually made of glass, which swing open from the center. They are designed to create a seamless transition between indoor and outdoor spaces, allowing natural light to flow into a room while providing a view of the outside. These doors are often used in homes to connect living areas to patios or gardens. French doors can be made from various materials, including wood, fiberglass, and aluminum, and they come in different styles to match the aesthetic of a home.