Entire population of the world is divided into separate territorial political communities, or independent state, which profoundly affect the way people live.
The branch of political science that is concerned with the foreign affairs of and relations among countries.
International Relations (IR), or International affairs is a field of Political Science. International Relations is the study of relationships among countries, the roles of sovereign states, inter-governmental organizations (IGO), international non-governmental organizations (INGO), non-governmental organizations (NGO), and multinational corporations (MNC)
Traditional (states only): War, diplomacy, sanctions, foreign aid, military alliances, intergovernmental organizations (IGOs)
Non-traditional (including non-state actors): Nongovernmental organizations (NGOs), terrorism, drug trade
Trade in goods, financial services, remittances, sanctions, drug trade
Migration, tourism, professional organizations, human rights, adoptions, religion, etc.
IR encompasses much more than the relations among nation-states and international organization and groups. It includes a great variety of transitional relationships, at various levels, above and below the level of the nation-state, still the main actor in international community.
Relations between many entities of uncertain sovereignties.
# Groups like: nations, states, governments, peoples, regions, alliances, confederations, international organizations, industrial organizations, religious organizations, etc.
International relations embraces all kind of relations traversing state boundaries, no matter whether they are an economic, legal, political, or any other character, whether they be private or official and all human behavior originating on one side of the state boundary and affecting human behavior on the other side of the boundary.
In simple and narrowest sense, IR is taken to donate the study of relations between states. IR denotes interactions between state-based actors across state boundaries.