The significance of international relations theory lies in its ability to analyze and explain the interactions between countries, influencing foreign policy and strategic decision-making. Theories, such as realism, liberalism, and constructivism, provide frameworks for understanding power dynamics, cooperation, and conflict among nations. These theoretical perspectives guide policymakers as they navigate complex global issues, such as security, trade, and human rights. By applying these theories, nations can better forecast outcomes and develop strategies for effective engagement on the international stage.