Velcro sticks two sides together for a secure hold. The two sides of Velcro are called the hook and the loop, which are each sold separately. The loop is the soft and fuzzy side, and the hook is the hard and rough-textured side. It comes in different widths and lengths and can either be sew-on and adhesive. Sew-on Velcro is applied by sewing both sides to the fabric. Adhesive Velcro has a sticky side that is placed on a surface, allowing the Velcro to stick. Check out the video for more info!