A machine gun is a type of firearm designed to fire bullets automatically, meaning it can shoot continuously as long as the trigger is held down. These weapons are typically used in military settings and can be mounted on vehicles or tripods for stability. They are known for their high rate of fire, which allows them to deliver a large volume of firepower quickly. Machine guns come in various calibers and designs, including light machine guns and heavy machine guns. They are often fed by belts or magazines, enabling them to sustain fire over extended periods. Due to their destructive capability, machine guns are subject to strict regulations in many countries.