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A mortised lock is characterized by a specifically designed cavity that is cut into the edge of the door to accommodate the lock. This allows the body of the lock to be recessed into the door, providing better security and a more streamlined appearance. The installation process typically requires precise cutting and alignment, ensuring that the lock fits snugly within the door frame. This feature distinguishes mortised locks from surface-mounted locks, which are installed directly on the surface of the door without the need for a cavity. The tailored design of the mortised lock contributes to enhanced aesthetics and security for the door it is installed in.