A BB gun is a type of air gun designed to shoot small metal or plastic pellets called BBs. These guns use compressed air or gas to propel the projectiles, making them popular for target shooting and recreational use. BB guns are often used for training purposes and can help improve marksmanship skills. BB guns come in various styles, including spring-powered, CO2-powered, and pump-action models. They are generally less powerful than traditional firearms, making them safer for use in controlled environments. However, safety precautions should still be taken, as BBs can cause injury if misused.