Interdependence refers to the interconnectedness and mutual dependence of states, organizations, and individuals in the international system. Interdependence can take many forms, including economic interdependence, political interdependence, and interdependence in areas such as security, environment, and human rights. The concept of interdependence is central to the study of International Relations, as it highlights the complex relationships and interconnections that exist between actors in the global arena.
Source: Keohane, R. O., & Nye, J. S. (1977). Power and interdependence: world politics in transition. Boston: Little, Brown.