The military refers to the organized armed forces of a nation or state, typically tasked with defending the country, its interests, and its citizens from external threats. It is a hierarchical institution with defined roles and responsibilities, encompassing branches such as the army, navy, air force, and sometimes additional specialized units. Military personnel undergo rigorous training and adhere to strict codes of conduct in carrying out their duties, which may include combat operations, peacekeeping missions, disaster relief efforts, and other forms of national defense.