The main function of a keychain is to facilitate carrying and managing keys. It can fix the keys together, so that we won't easily lose or forget to bring the keys. Through keychains, we can categorize and organize keys such as home keys, car keys, and office keys, making it easier for us to find the keys we need and saving us time and energy. In addition, keychains are also a personalized decoration, with various shapes, materials, and patterns that can be chosen according to personal preferences. Some people like to customize keychains with their names or photos to showcase their unique personality; Some people like to choose keychains related to their favorite movies, anime, or sports stars to showcase their hobbies and pursuits. Both the simple and elegant design and the colorful patterns add a lot of fun and charm to the keychain.