The term 'Zipperless Zipper' refers to a type of fastener that uses Velcro instead of a traditional zipper. Velcro is a hook-and-loop fastener made of two strips of fabric, one with tiny hooks and the other with small loops. When pressed together, the hooks catch in the loops and create a secure closure. Velcro is often used as an alternative to zippers, buttons, or snaps, and is especially popular for children's clothing.