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 provide a secure closure and are easy to use, making them a popular choice for various applications. Invented in the late 19th century, the zipper has evolved over time, with different designs and materials being developed. Today, zippers can be found in many products, including jackets, backpacks, and suitcases, enhancing both functionality and style.