A war bond is a debt security issued by a government to finance military operations during times of conflict. Citizens can purchase these bonds, effectively lending money to the government, which promises to pay back the principal amount with interest after a specified period. War bonds are often marketed as a patriotic duty, encouraging citizens to support their country during wartime. During major conflicts like World War II, war bonds played a crucial role in raising funds for military expenses. Governments used various campaigns to promote bond sales, appealing to the public's sense of duty and national pride. The funds raised helped support troops, purchase equipment, and sustain wartime efforts.