What is a "hook-and-loop fastener"?

A hook-and-loop fastener is a type of mechanical fastener commonly used in clothing, footwear, and other products. It consists of two components: a "hook" side, which is covered with tiny hooks, and a "loop" side, which is covered with soft, fibrous loops. When pressed together, the hooks grip the loops and hold the two sides together. The fastener can be easily opened and closed, making it a convenient and versatile option for a wide range of applications. It is also known by its brand name, Velcro.