An automatic firearm is a type of gun that can fire multiple rounds continuously with a single pull of the trigger. This means that as long as the trigger is held down, the firearm will keep firing until the ammunition is exhausted or the trigger is released. Automatic firearms are often used by military and law enforcement for their rapid-fire capabilities. These firearms operate using the energy generated from firing a round to automatically cycle the action and load the next cartridge. Common examples of automatic firearms include submachine guns and assault rifles, which are designed for high rates of fire and are typically more complex than semi-automatic firearms, which require a separate trigger pull for each shot.