Automatic firearms are weapons that can fire multiple rounds with a single pull of the trigger. They are designed to continue firing as long as the trigger is held down, making them distinct from semi-automatic firearms, which require a separate trigger pull for each shot. Common examples of automatic firearms include machine guns and submachine guns. These firearms are often used by military and law enforcement agencies due to their high rate of fire. However, their use is heavily regulated in many countries, and ownership may require special permits or licenses. The design and functionality of automatic firearms can vary widely, depending on their intended purpose.