The United Nations was established in 1945 with 51 founding member countries committed to maintaining international peace and cooperation. It now has 192 member states. The UN Charter sets out basic principles for the organization to uphold, including maintaining peace and security, promoting human rights, and acting as a forum for international cooperation. The main UN bodies are the General Assembly, Security Council, Economic and Social Council, Trusteeship Council, Secretariat, and International Court of Justice. Specialized agencies are also linked to the UN to address issues like health, trade, development, and labor.