This book has been written with the objective of providing a complete and systematic constitutional background to the study of the subject of Indian Polity in the UPSC Civil Services Preliminary (General studies; I) and Main (General studies; II) examinations. In addition, the book is also useful to the various State Services Examinations and other competitive examinations conducted by the UPSC, SSC, UGC and other bodies. Further, this book is also useful to the University students, teachers and other readers who are interested in knowing the Indian constitutional system.