The 9x18mm Makarov is a semi-automatic pistol cartridge developed in the Soviet Union in the late 1940s. It was designed for use in the Makarov PM pistol, which became the standard sidearm for Soviet and Warsaw Pact forces. The cartridge features a bullet diameter of 9mm and a case length of 18mm, providing a balance of manageable recoil and effective stopping power. This cartridge is known for its reliability and simplicity, making it popular in various military and law enforcement applications. It is also used in civilian firearms, with many manufacturers producing compatible pistols. The 9x18mm Makarov remains a notable choice for self-defense and recreational shooting.