International Relations (IR) explores interactions between states, non-state actors, and international organizations in the global system. Key concepts include sovereignty, power, national interest, diplomacy, and international law. The field examines how these elements shape global politics and influence decision-making. IR's historical context spans from the Treaty of Westphalia to modern challenges like terrorism and climate change. Major theories like realism, liberalism, and constructivism offer different perspectives on global dynamics. The field continues to evolve, addressing emerging issues in an increasingly complex world.