Package of gunpowder and a bullet that can be conveniently inserted into a firearm for firing. The cartridge consists of (in order of operation): primer (shock sensitive explosive), gunpowder (ignites to propel the bullet), case (cylindrically shaped brass container to hold the gunpowder), and bullet. A metal rod called a firing pin strikes the primer to generate a spark which ignites the gunpowder to propel the bullet.
