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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. It is usually employed by personnel whose job demands frequent use of keys, such as a security guard, prison officer, janitor, or retail store manager. The chain is often retractable, and therefore may be a nylon rope, instead of an actual metal chain. The chain ensures that the keys remain attached to the individual using them, makes accidental loss less likely, and saves on wear and tear on the pockets of the user.
Some spell checkers and dictionaries do not recognize the spelling "keychain," but separate the word into "key chain." Keychain collectors and many other people prefer to use it as a compound word ("keychain").
There are many other terms that all refer to keychain as well. These include key ring, key holder, key tag, and key fob.
Use of keychains
Keychains are one of the most common souvenir and advertising items. Keychains are commonly used to promote businesses. A standard advertising key chain will carry the businesses name and contact information and often a logo.
In the 1950s and 1960s, with the improvement of plastic manufacturing techniques, promotional items including keychains became unique. Businesses could place their names on promotional keychains that were three-dimensional for less expensive than the standard metal keychains.
Keychains are small and inexpensive enough to become promotional items for larger national companies that might give them out by the millions. For example, with the launch of a new movie or television show, those companies might partner with food companies to provide a character keychain in each box of cereal.
Keychains that currently hold keys are an item that is never long misplaced by the owner. Many keychains also offer functions that the owner wants easily accessible as well. These include an army knife, bottle opener, an electronic organizer, scissors, address book, family photos, nail clipper, pill case and even pepper spray. Modern cars often include a keychain that serves as a remote to lock/unlock the car or even start the engine. An electronic key finder is also a useful item found on many keys that will beep when summoned for quick finding when misplaced.
A keyring or "split ring" is a ring that holds keys and other small items, which are sometimes connected to keychains. Other types of keyrings are made of leather, wood and rubber. Keyrings were invented in the 19th century. The most common form of the keyring is a single piece of metal in a 'double loop'. 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.
A key fob is a generally decorative and at times useful item many people often carry with their keys, on a ring or a chain, for ease of tactile identification, to provide a better grip, or to make a personal statement. The word fob may be linked to the low German dialect for the word Fuppe, meaning "pocket", however, the real origin of the word is uncertain. Fob pockets (meaning 'sneak proof' from the German word Foppen) were pockets meant to deter thieves. A short "fob chain" was used to attach to items, like a pocket watch, placed in these pockets. 
Fobs vary considerably in size, style and functionality. Most commonly they are simple discs of smooth metal or plastic, typically with a message or symbol such as that of a logo (as with conference trinkets) or a sign of an important group affiliation. A fob may be symbolic or strictly aesthetic, but it can also be a small tool. Many fobs are small flashlights, compasses, calculators, penknives, discount cards, bottle openers, security tokens and USB flash drives. As electronic technology continues to become smaller and cheaper, miniature key-fob versions of (previously) larger devices are becoming common, such as digital photo frames, remote control units for garage door openers, barcode scanners and simple video games (e.g. Tamagotchi) or other gadgets such as breathalyzers.
Some retail establishments such as gasoline stations keep their bathrooms locked and customers must ask for the key from the attendant. In such cases, the keychain has a very large fob to make it difficult for customers to walk off with the key.
The costs of keychains vary widely depending on their purpose. Advertising keychains begin at only a few cents a piece to a few dollars each. They are normally purchased in large quantities often over 500 at a time.
Keychains are found in retail stores to represent things such as television shows, movies, video games, nostalgia, hobbies, interests and personalities. These keychains range from a dollar up to ten dollars and more.
Electronic keychains including games and small organizers start at a few dollars and can be up to 50 US dollars. Other keychain electronics including cameras, digital photo frames and USB drives start around ten USD and can go over 100 USD.
Souvenir keychains are one of the most popular keychains that sell. These are keychains that represent a trip or a location that a person is visiting. These most commonly range from under a dollar to ten dollars.
As a collectible item
The most popular focused keychain collections are advertising, souvenir, monument, popular characters and nostalgia-related items.
Collectors display and store their keychains in several different ways. Some collections are small enough that the collector can place all of their keychains on their standard key ring. Some larger collections can be stored and displayed on dowels, cork boards, tool racks, on large link chains, in display cases, hung on walls, displayed on Christmas trees. Some collections are large enough that entire rooms are dedicated to the keychain collection.
Unlike most collections, keychains don't hold their value as well as other collections. A standard keychain that was purchased for five dollars new may only be worth less than a dollar once it has been owned regardless of condition.
Items commonly attached via a keychain or keyring include:
- Bottle openers
- Credit cards
- Digital sound recorders
- Electronic games
- Gym membership cards
- Laser pointers
- Library cards
- Logos, slogans, or phrases
- Loyalty program cards
- Memo pads
- Nail clippers
- Ornamental or decorative items
- Personal sirens
- Pill boxes
- Photos (photo holders)
- Pocketknives and Penknives
- Rabbit's feet
- Religious items (e.g., crosses, Traveller's Prayers, or hamsas)
- Security tokens
- Tape measures
- Text labels
- Thermometers (analog and digital)
- Tools (e.g., Swiss Army knives)
- USB flash drives
- Vehicle remote keyless system fobs
- Watches and stopwatches
Access control key fobs
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Electronic key fobs, which are used for activating such things as remote keyless entry systems on motor vehicles. Early electric key fobs operated using infrared and required a clear line-of-sight to function. These could be copied using a programmable remote control. More recent models use challenge-response authentication over radio frequency, so these are harder to copy and do not need line-of-sight to operate. Programming these remotes sometimes requires the automotive dealership to connect a diagnostic tool, but many of them can be self-programmed by following a sequence of steps in the vehicle and usually requires at least one working key.
Key fobs are used in apartment buildings and condominium buildings for access to common areas (for example, lobby doors, storage areas, fitness room, pool). These usually contain a passive RFID tag. The fob operates in much the same manner as a proximity card to communicate (via a reader pad) with a central server for the building, which can be programmed to allow access only to those areas in which the tenant or owner is permitted to access, or only within certain time frames.
Telecommuters may also use an electronic device known as a key fob that provides one part of a three way match to log in over an unsecure network connection to a secure network. This kind of key fob may have a keypad on which the user must enter a PIN to retrieve an access code, or it could be a display-only device.
By analogy to the physical object, the terms keychain and keyring are often used for software that stores cryptographic keys. The term keychain was first introduced in a series of IBM developerWorks articles. The term is used in GNU Privacy Guard to store known keys on a keyring.
A "keyring" is also the name of a password manager application working under the GNOME desktop manager (used for example in Ubuntu operating system). It is general term used in cryptography for a database of multiple keys or passwords.
- Loc8tor key finder
- "fob - alphaDictionary * Free English On-line Dictionary". Alphadictionary.com. Retrieved 14 August 2012.
- "Largest Collection of Keychains". Guinness World Records. Retrieved 3 April 2011.