Military ranks are a system used to classify members of the armed forces based on their level of authority and responsibility. Each rank has specific duties and privileges, which help maintain order and discipline within the military. Common ranks include Private, Corporal, Sergeant, Lieutenant, and Captain, with higher ranks typically having more leadership responsibilities. The ranking system varies between different branches of the military, such as the Army, Navy, Air Force, and Marine Corps. Each branch has its own unique titles and insignia, but the overall structure is similar, allowing for effective organization and command across various units and operations.