The abbreviation "UN" stands for the United Nations, an international organization founded in 1945 after World War II. The UN's primary objectives include promoting peace, security, and cooperation among countries while working on global issues such as poverty, development, human rights, and environmental sustainability. The organization consists of 193 member states and has various specialized agencies, including the World Health Organization (WHO) and the United Nations Educational, Scientific and Cultural Organization (UNESCO). The UN also plays a crucial role in facilitating diplomatic dialogues, peacekeeping missions, and humanitarian efforts worldwide, making it a significant player in international relations today.