Cap guns are toy firearms designed to make a loud popping sound when fired. They use small paper or plastic caps that contain a small amount of explosive material. When the trigger is pulled, a hammer strikes the cap, creating a noise similar to a real gunshot, but without any projectile being fired. These toys are often made to resemble real guns and are popular among children for imaginative play. While cap guns can be fun, safety is important, as they can sometimes be mistaken for real firearms. Parents should supervise their use and educate children about gun safety and responsible play.