The term "air force" refers to a branch of a nation's military that is responsible for aerial warfare and operations. It typically includes various aircraft, such as fighter jets, bombers, and transport planes, which are used for defense, reconnaissance, and support missions. The air force plays a crucial role in protecting a country's airspace and can also assist in humanitarian efforts. Air forces are often part of a larger military structure, which may include the army and navy. They are equipped with advanced technology and trained personnel to carry out complex missions. Many countries have their own air force, such as the United States Air Force and the Royal Air Force in the United Kingdom.