What is a door jamb?

A door jamb is the vertical portion of a door frame that secures the door in place when closed. It typically consists of two upright pieces known as the side jambs and a horizontal piece known as the head jamb. The door jamb is usually made of wood, metal, or composite materials and is essential for providing stability and support to the door. It also helps to seal the door against drafts and noise. The door jamb may also have a strike plate attached to it, which is where the latch of the door secures when closed. Additionally, door jambs can be customized with decorative trim or moulding to enhance the aesthetics of the door frame.