A mortise lock is a type of locking mechanism that is installed into a pocket, or mortise, cut into the edge of a door. This design allows the lock to be flush with the door surface, providing a clean and secure appearance. Mortise locks are commonly used in commercial and residential settings due to their durability and strength. These locks typically consist of a lock body, a deadbolt, and a handle or knob. They can be operated with a key or a thumb turn, making them versatile for various applications. Mortise locks are often associated with higher security compared to standard cylindrical locks, making them a popular choice for entry doors.