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Key is a small, usually metal instrument that is used to lock or unlock a door, start a car, or open a padlock. It is typically shaped like a long, narrow blade with a series of ridges or notches along one edge, which correspond to the pins or tumblers inside a lock. The key is inserted into the lock and turned to either engage or disengage the locking mechanism. Keys are an essential tool for securing and accessing various items and spaces, and they come in a variety of shapes, sizes, and designs to fit different types of locks. In addition to traditional physical keys, there are also electronic keys and keycards that use technology to unlock doors and start vehicles.