The term "realist theory" in politics refers to an approach that emphasizes the role of power and national interest in international relations. Realist theorists assert that states act primarily to pursue their own interests, often prioritizing security over moral or ideological concerns. This perspective highlights the competitive nature of international politics and the inevitability of conflict among states. Realism serves as a foundational theory that influences foreign policy decisions, promoting pragmatic assessments of global dynamics and the behavior of other nations.