The document discusses different types of doors. It describes 18 types of doors including battened and ledged doors, which are the simplest type using vertical battens and horizontal ledges. Braced and ledged doors add diagonal braces for increased strength. Framed and ledged doors improve on this with vertical styles. Panel doors consist of a frame with vertical styles and horizontal rails containing wood or other panels. Other door types discussed include glazed doors, louvered doors, revolving doors, sliding doors, and flush doors.