Many changes have taken place in international relations since 1993 when first edition of this book was published. As against twenty-two chapters in the first edition, thirty-two in the second edition (2001), thirty-five chapters in third edition (2004), thirty-six chapters in fourth edition (2012) and this fifth edition has thirty-seven chapters. This fifth edition also includes a new chapter on Prime Minister Modi’s foreign policy. The book also contains chapters on contemporary topics such as environment, globalization, international terrorism and human rights. Besides, all the existing chapters have been revised and updated in the light of the latest developments. In the last 100 years of international relations there were two major turning points; one after the Second World War (1945) and another after the end of the Cold War (1991). The present work covers the events of both post-World War II period and post-Cold War era of contemporary international relations. The first fourteen chapters relate to theoretical aspects of international relations. The subsequent twenty-three chapters deal with practical international relations that were maintained at international level from 1945 to this day. More than 72 years of India's foreign policy has been condensed in to two separate chapters for the convenience of the readers. This book will be very useful for students and teachers of International Relations, Political Science, History, Diplomacy and International Organization. It will be equally helpful to the candidates preparing for various competitive exams such as IAS, IPS and central services. Dr. Vinay Kumar Malhotra; B.A. (Honours.), M. A. (Gold Medalist), Ph.D.; 29 years teaching and research experience; 9 years administrative experience; 20 books mostly on international relations, 28 papers and 8 book-reviews published.