Cap guns are toy firearms designed to make a loud popping sound when fired. They use small paper or plastic caps that contain a tiny amount of explosive material. When the trigger is pulled, the cap is struck, 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, it's important for parents to supervise their use and ensure that children understand the difference between toys and real firearms, promoting safe play practices.