A weapon that has existed since the 13th Century and has been developing more and more, as well as diversifying ever since.
They come in small, handheld forms known as pistol
s or handguns; or automatic, repeating-fire, styles known as machine guns; and longer types with stocks and that are designed to be fired from the shoulder: these are known as rifle
s. The many kinds of guns, the mechanical/technical information of a gun, and so on are WAY too long to list here. For additional information I recommend looking at the other examples below.