A door part is any component of a door that helps it to function properly. The JAMB is the vertical side of the door frame, and the HASP is a metal loop used to secure the door. The HINGE is a joint that connects the door to the frame, allowing it to swing open and closed. The LATCH is a device used to keep the door closed, while the SASH is the horizontal part of the door frame. The SILL is the bottom part of the door frame, and the KNOB is a handle used to open the door. The STILE is the vertical part of the door frame, and the PANEL is the flat part of the door. Finally, the LINTEL is the top part of the door frame.