The international organization formed after World War II to promote peace and security is the United Nations (UN). Established in 1945, the UN aims to prevent conflicts and foster international cooperation. Its founding principles are articulated in the UN Charter, which emphasizes human rights, self-determination, and the promotion of social progress. The organization consists of various bodies, including the General Assembly and the Security Council, which play crucial roles in addressing issues such as humanitarian crises, international law, and peacekeeping efforts.