A smoothbore gun is a type of firearm that has a barrel without rifling, meaning it lacks the grooves that spin a projectile for greater accuracy. This design allows for the firing of various types of ammunition, including solid projectiles and shot, making it versatile for different uses. Smoothbore guns are commonly used in shotguns and some artillery pieces. These firearms are effective at short ranges, as the lack of rifling can lead to a spread of shot, increasing the chance of hitting a target. They are also used in military applications, such as with cannons and howitzers, where the ability to fire explosive shells is crucial.