A mortise lock is a type of lock that is installed within the body of a door, rather than being attached to the surface

One of the primary ways a mortise lock affects door security is through its robust build. The inner workings of a mortise lock are encased within the door itself, making it significantly more difficult to tamper with or force open compared to surface-mounted locks. This design reduces the risk of intruders bypassing the lock through physical manipulation or destructive methods such as prying or wrenching.