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A keychain or key chain is a small chain, usually made from metal or plastic, that connects a small item to a keyring. the length of a keychain allows an item to be used more easily than if connected directly to a keyring. some keychains allow one or both ends the ability to rotate, keeping the keychain from becoming twisted, while the item is being used. a keychain can also be a connecting link between a keyring and the belt of an individual.