The United Nations was established in 1945 to replace the ineffective League of Nations and promote international cooperation. It aims to maintain international peace and security, protect human rights, deliver humanitarian aid, and achieve sustainable development goals. The UN has six principal organs that carry out its work: the General Assembly, Secretariat, Security Council, Economic and Social Council, International Court of Justice, and Trusteeship Council. It currently has 193 member states and 2 observer states. India is a founding member of the UN and has contributed troops to peacekeeping missions while advocating for UN reform.