9mm Luger is a type of ammunition that is widely used in handguns and submachine guns. It is also known as 9mm Parabellum or simply 9mm. The name "Luger" comes from Georg Luger, the German firearms engineer who designed the cartridge in 1901. The 9mm Luger cartridge is rimless and tapered, encasing a bullet that is 9 millimeters in diameter. It is the most popular handgun and submachine gun cartridge due to its low cost, adequate stopping power, and extensive availability. The 9mm Luger is especially popular for compact carry pistols and is a potent cartridge for its size. The terms "9mm" and "9mm Luger" are used interchangeably, and there is no difference between them.