The United Nations (UN) is an intergovernmental organization established in 1945 following World War II, with the aim of fostering international peace and security, promoting human rights, and encouraging social and economic development. Headquartered in New York City, the UN comprises 193 member states and operates through specialized agencies, programs, and peacekeeping missions. It plays a central role in addressing global challenges such as climate change, humanitarian crises, and conflict resolution.