The acronym "UN" stands for the "United Nations," which is an international organization founded in 1945. It aims to promote peace, security, and cooperation among member states. The UN addresses global challenges such as climate change, human rights, and development. It has six main organs, including the General Assembly and the Security Council, each serving distinct functions to maintain international order and cooperation. The UN is headquartered in New York City and consists of 193 member states, making it a key player in global diplomacy and collective action.