A door leaf is a single, individually operable door panel. The single-leaf door is the most prevalent door type. It consists of a single panel that fills the entire doorway.
Double-leaf doors, often known as French doors, have two outward-swinging panels. Doors are utilised to restrict or permit entry to areas. Typically, they have an inner and exterior side and consist of a hinged or swinging panel. In addition to controlling airflow and temperature within a space, doors are sometimes used to screen off regions for aesthetic purposes. The oldest depictions of doors are found in ancient Egyptian tomb art.