Which type of lock, other than a cylindrical lock, is designed to fit in a predrilled opening on the side of a door and is commonly found in hotel rooms?

The mortise lock is specifically designed to fit within a predrilled pocket, or "mortise," on the edge of a door, making it suitable for installation in various types of doors, including hotel room doors. This design allows for a stronger and more secure lock mechanism compared to surface-mounted locks, as it is recessed into the door itself. The mortise housing accommodates both the locking mechanism and the key cylinder, which enhances the lock's durability and resistance to tampering. The presence of a mortise lock is common in hotel settings due to the higher security needs and the aesthetic appeal of a less visible locking mechanism, contributing to a seamless appearance on the door.