A shotgun is a weapon that is typically used to fire multiple projectiles in one shot. Many types of ammunition exist for the shotgun, such as slugs (single projectile) and shot (multiple small caliber projectiles).
There are many different actions used in shotguns, with break, pump, and semi-auto being the most common. Break-action shotguns are normally fed by hand, which means the user will need to eject the spent shell and place a new one in its place. Pump action typically feeds from a internal tube magazine under the barrel, as do most semi-auto shotguns, although some modern types used come equipped with a detachable box magazine..
Some shotguns are capable of fully automatic fire.