A zip, also known as a zipper, is a fastening device used in clothing, bags, footwear, and other fabric products to join two edges of material securely while allowing for easy opening and closing. It consists of two rows of interlocking teeth or coils made of metal or plastic, which are bound to fabric tapes. A slider moves along these rows, engaging or separating the teeth with a simple pull. Invented in the late 19th century and widely adopted in the 20th, the zip revolutionized fashion and functionality by providing speed, durability, and convenience compared to buttons, hooks, or laces. Beyond clothing, zips are essential in luggage, outdoor gear, upholstery, and even industrial uses, proving their versatility. Their design varies—such as invisible zippers for seamless garments, heavy-duty zippers for rugged wear, and waterproof zippers for outdoor equipment. Simple yet ingenious, the zip remains one of the most practical and universally used fasteners in the modern world.