United Nations is an international organization that prevents wars and promotes close co-operation among the States in the world. It is an umbrella under which virtually all the States gather to forge Community effort and One World. This book clearly explains the aims and objectives of the United Nations. It analyzes the General Assembly and throws light on its functions. It appraises the Security Council and sheds light on its functions. It evaluates the Secretariat and casts light on its functions. It discusses the Economic and Social Council and highlights its distinctive functions. It examines the International Court of Justice and throws light on its onerous functions. It explores the achievements and problems of the United Nations. And it remains to be seen if the United Nations possesses the verve and vigour that can still conquer illiteracy, poverty, corruption, unemployment, brain drain, nuclear proliferation and terrorism in the world.