Clip-on is an item that can be attached to an object without the need for tools or adhesives. It is typically used to secure items such as jewelry, clothing, and accessories. The term clip-on is derived from the fact that the item is attached by clipping it onto the object. Clip-on items are often used in place of traditional fasteners such as buttons, snaps, and zippers. They are also used to secure items such as eyeglasses, badges, and ID cards.