A tumbler lock is a type of locking mechanism commonly used in doors and cabinets. It operates using a series of pins or tumblers that must be aligned to allow the lock to open. When the correct key is inserted, it lifts the pins to the right height, enabling the lock to turn and unlock. These locks are popular due to their simplicity and effectiveness. They come in various designs, including pin tumbler locks and wafer tumbler locks, each offering different levels of security. Tumbler locks are widely used in residential and commercial settings for their reliability.