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A gun is an aimable weapon that fires projectiles at high velocity, or a device that resembles such a weapon used for other purposes (e.g., glue gun) in common usage. The term is also used for types of artillery with long barrels that fire at a relatively flat trajectory. The term gun is often used as a synonym to firearm, but technically only refers to smoothbore firearms and naval artillery, with rifles not being called a gun.
Most guns are designed to kill people or animals, with a minority being designed for sporting purposes.