A tumbler lock is a type of locking mechanism commonly used in doors and safes. It operates using a series of small, movable components called tumblers. When the correct key is inserted, the tumblers align at the right height, allowing the lock to turn and open. These locks are popular due to their simplicity and effectiveness. They can be found in various applications, from residential doors to high-security safes. The design of a tumbler lock can vary, but the basic principle remains the same, making it a reliable choice for securing valuables.