Pop guns are toy guns designed to produce a popping sound when fired. There are several synonyms for pop guns, including cap guns, snap guns, and poppers. Cap guns use small capsules of explosives to create a popping sound when fired. Snap guns are also known as pull-string guns, as they require a string to be pulled to produce a sound. Poppers are similar to cap guns, using small pellets or balls to create a popping noise. While these toys have been popular for many years, some people have concerns about their safety and encourage parents to consider alternative toys for their children.