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a key chain, also known as a key chain or key ring, is a small ornament used to carry and organize keys. it is usually made of materials such as metal, plastic or leather and has a ring-shaped structure that holds the keys together and can be easily carried. key chains can help you organize multiple keys together and avoid the loss and confusion of keys. by threading the key through the loop on the keychain, you can carry and identify different keys more easily. keychains are also used as decorations to show an individual's style and interests. they can have a variety of shapes, colors and patterns, such as cartoon characters, logos, name letters, etc., to meet different people's preferences. keychains are also often used as souvenirs, such as tourist souvenirs, concerts, sporting events and other activities. they can become collectibles or display personal experiences and memories. a keychain is a practical and versatile small ornament that helps organize keys, show personality, promote the brand, and become a souvenir to commemorate special moments..syi