Pistol ammunition consists of cartridges designed for use in handguns. Each cartridge typically includes a bullet, gunpowder, and a primer, all housed in a metal casing. The bullet is the projectile that is fired, while the gunpowder ignites when the primer is struck, creating gas that propels the bullet out of the barrel. There are various types of pistol ammunition, including 9mm, .45 ACP, and .40 S&W, each with different characteristics suited for specific purposes. Factors such as bullet weight, velocity, and design can affect performance, making it important for shooters to choose the right ammunition for their needs.