Military ranks are a system used to classify members of the armed forces based on their level of authority, responsibility, and experience. Each rank has specific duties and privileges, which help maintain order and discipline within the military structure. Common ranks include Private, Corporal, Sergeant, and Lieutenant, with higher ranks like Captain and Major indicating greater leadership roles. 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 hierarchy remains similar, ensuring effective command and control during operations.