The doorjamb to which hinges are attached.

What is a door jamb vs door frame?

Many people confuse a door jamb and a door frame. A simple way to remember it is that a door jamb is part of a door frame. The flat surface that runs vertically up either side of the door frame is the jamb.

Is a door jamb necessary?

Often overlooked, ignored, or underappreciated, the door jamb plays a very important role in every home. Leveling and Support. The primary purpose of the door jambs, and the door frame as a whole, is to provide a lasting support for the door. When hung, the door relies on this framing.