Velcro is a type of nylon fabric used as a fastening. It was invented in 1941 by Swiss engineer George de Mestral, and is composed of two strips of fabric with tiny hooks on one side and loops on the other. When pressed together, the hooks catch in the loops and create a secure bond. Velcro is widely used in a variety of applications, from clothing to furniture, and is an effective and convenient way to fasten items together.