Keychains are commonly used to promote businesses. A standard advertising key chain will carry the businesses name and contact information and often a logo. The most popular advertising keychains are shaped like a "number 1" to imply the quality of the business that is advertising. Other popular shapes are a house, owl and squares or rectangles.

In the 1950s and 1960s with the improvement of plastic manufacturing techniques, promotional items including keychains became more unique. Businesses could place their names on promotional keychains that were three dimensional for less expensive than the standard metal keychains.

Kchains 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 etc.

 
A souvenir sandal keychain from the PhilippinesKeychains 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.

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Keychains are one of the most common souvenir items. They are very inexpensive and small to store both while traveling home and don't take up much room in a home. Keychains can act as a reminder of the trip since they can be carried around during everyday life. They also are gender and age neutral and can appeal to many types of vacation shoppers.