Key (lock mechanism)

A shaped object inserted into a corresponding lock to move or align internal components and permit or prevent operation.

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Pin tumbler lock: A lock whose spring-loaded pin pairs block a plug from turning until aligned at a shear line. A common lock design in which a notched key raises pins to the required alignment.
Keyway: The profile of a key and the matching channel in a lock cylinder. The keyway restricts which key blanks can enter the lock.
Automotive key: A key or electronic device used to unlock and authorize operation of a motor vehicle. Vehicle keys combine door access with ignition or immobilizer authorization.
Combination lock: A lock opened by entering a sequence of numbers or symbols rather than using a key. It grants access through a memorized code instead of a shaped object.
Lever tumbler lock: A lock in which a key raises levers until their gates align, allowing a bolt to move. Its key lifts internal levers rather than aligning pin pairs.
Key blank: An uncut key-shaped piece of material prepared for cutting to fit a particular lock. Cutting begins with a blank whose profile matches the lock’s keyway.
Skeleton key: A simplified key designed to operate certain warded locks by bypassing most internal wards. It illustrates how a specially shaped key can serve several compatible locks.
Biometric authentication: Identity verification using measurable biological traits such as fingerprints or facial features. It can replace possession of a physical key with recognition of a person.
Wafer tumbler lock: A lock using flat spring-loaded wafers that must align for its plug to turn. The key’s cuts raise wafers to clear the plug’s rotation path.
Bitting: The pattern of cuts or depths on a key that corresponds to a lock’s internal coding. Bitting is the specific pattern that makes one key operate its intended lock.