A machine gun is a type of firearm designed to fire bullets automatically, allowing for rapid and continuous shooting as long as the trigger is held down. These weapons are typically used in military settings and can be mounted on vehicles or used by infantry. They are known for their high rate of fire and ability to cover large areas with suppressive fire. Machine guns come in various calibers and designs, including the well-known M249 and M60. They are often fed by belts or magazines and can be used in different roles, such as support weapons or for defensive purposes. Their development has significantly influenced modern warfare tactics.