International relations

International relations is a branch of political science. Predominant study topics are politics, economics and law on a global level. It represents the study of foreign affairs and global issues among states within the international system, including the roles of states, diplomacy, international organizations (IGOs), non-governmental organizations (NGOs), and multinational corporations (MNCs). 
United Nations.
The United Nations (UN) is an international organization that describes itself as a "global association of governments facilitating co-operation in international law, international security, economic development, and social equity"; It is the most prominent international institution. Many of the legal institutions follow the same organisational structure as the UN.