International Relations is a comprehensive guidebook designed to provide insightful knowledge to aspiring candidates preparing for the competitive examinations. It offers a detailed exploration of the dynamic field of international relations, focusing on key concepts, theories, and current global affairs that are essential for general knowledge and overall success in the examinations. The book begins with an introduction to the foundations of international relations, elucidating the historical development and theoretical frameworks that shape the study of international politics. On one hand it defines the basics of international relations, while on the other hand, it delves into the complexities of the international system, analyzing the roles and interactions of state and non-state actors, the dynamics of power, and the overall impact of globalization and regionalism. Drawing from real-world examples, the text examines the core concepts and principles of international relations, including sovereignty, diplomacy, security, conflict resolution, and international organizations. While analyzing the dynamic nature of international relations and trans boundary issues, it offers a nuanced understanding of their implications for national and international security. Moreover, the book examines the evolving role of emerging powers, regional dynamics, and the influence of global institutions like the United Nations, World Bank, and World Trade Organization as they attempt to manoeuver through the impending threats including terrorism, human rights violations and democratic backsliding. This text is an indispensable resource for aspirants seeking to excel in the International Relations component of the UPSC Civil Services Examination.