Snap is a type of fastener that is used to secure two objects together. It consists of two parts, a male and a female part, which are pressed together to form a closure. The male part has a protruding post that fits into the female part, which has a hole in it. Snaps are commonly used in clothing, such as on jackets, shirts, and pants, as well as on bags and other accessories. They are also used in upholstery and in some industrial applications.