A zipper is a fastening device commonly used in clothing, bags, and other items. It consists of two strips of fabric with interlocking metal or plastic teeth and a slider that moves up and down to open or close the zipper. Zippers are popular because they provide a secure closure while allowing for easy access. Zippers come in various sizes and types, including coil zippers, metal zippers, and invisible zippers. They are found in everyday items like jackets, pants, and backpacks. The invention of the zipper has greatly improved the functionality and convenience of clothing and accessories.