A shotgun shell is a type of ammunition designed for use in a shotgun. It typically consists of a cylindrical plastic or paper casing filled with multiple small pellets, known as shot, or a single projectile called a slug. The shell also contains gunpowder and a primer, which ignites the gunpowder when the trigger is pulled, propelling the shot or slug out of the barrel. Shotgun shells come in various sizes and types, including 12-gauge, 20-gauge, and 410-bore, each suited for different shooting purposes. They are commonly used for hunting game, sport shooting, and self-defense. The design allows for a spread of shot, increasing the chances of hitting a moving target.