A snap is a fastening of two parts (a stud and a socket) that join with a characteristic click when pressed. A snap fastens quickly and easily with one movement, without the need to thread a button through a buttonhole, so it is often used where speed and convenience matter: on children's clothing, sports and workwear, jackets, western-style shirts (where pearl snaps became a characteristic mark). Snaps come in sew-on and hammer-in (riveted) kinds, metal and plastic, hidden or decoratively pronounced. They combine function with a slightly sporty, practical character. A snap is a functional fastening detail, in which two parts joined by pressing ensure quick and convenient fastening, combining practicality with a recognisable sporty, workwear or western character depending on the execution.