Keyring

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A keyring, attached to several keys, an automotive remote entry device, a keychain, and a novelty carabiner.

A key can be added to a keyring by forcing an end of the loop open and sliding the key along the spiral.

A looped, metal keyring, with a plastic fob.

A keyring is a ring, usually made of metal or plastic, that holds keys and other small items, which are sometimes connected to keychains. Other types of keyrings are made of leather, wood and rubber.

The most common form of key ring is a metal ring consisting of two complete loops. Either end of the loop can be pried open to allow a key to be inserted and slid along the spiral until it becomes wholly engaged onto the ring. Novelty carabiners are also commonly used as keyrings for ease of access and exchange. Often the keyring is adorned with a key fob for self-identification.

Other forms of rings may use a single loop of metal or plastic with a mechanism to open and securely close the loop.

In the cryptography sense, a keyring stores known encryption keys (and in some cases, passwords). For example, GNU Privacy Guard uses the concept of keyrings.