Zippers are fastening devices consisting of two flexible strips with interlocking metal or plastic teeth, operated by a sliding mechanism. Invented in the early 20th century, they revolutionized clothing, luggage, and gear by offering a quick, secure alternative to buttons or laces. The slider aligns and separates the teeth when moved, while stops at each end prevent detachment. Common types include coil (nylon/plastic), metal, and invisible zippers, each suited to different applications. Durable and versatile, zippers are essential in fashion, outdoor equipment, and industrial uses. Innovations like waterproof or self-repairing designs continue to expand their functionality, making them a ubiquitous yet often overlooked modern convenience.