The United Nations is an intergovernmental organization established on October 24, 1945, following World War II to maintain international peace and security, develop friendly relations among nations, promote international cooperation, and foster social progress. Headquartered in New York City, the UN comprises six principal organs: the General Assembly, Security Council, Economic and Social Council, International Court of Justice, Secretariat, and Trusteeship Council. With 193 member states, it addresses global challenges through specialized agencies including the World Health Organization, UNESCO, and the World Bank. The organization operates in six official languages: Arabic, Chinese, English, French, Russian, and Spanish. Throughout its history, the UN has engaged in peacekeeping missions, humanitarian aid, human rights promotion, and sustainable development initiatives worldwide.