Keychain vs. Keyring — What's the Difference?

A keychain (also key fob or keyring) is a small ring or chain of metal to which several keys can be attached. The length of a keychain allows an item to be used more easily than if connected directly to a keyring.

A ring, normally of metal or plastic, for holding keys together.

A chain or ring to which a key may be attached.

(cryptography) A set of data holding linked encryption keys.

An ornamental piece holding such a chain or ring.

(cryptography) A digital repository for the storage of cryptographic keys.