This book is designed to help students in building their concepts in Data Structures. It introduces the subject in a simple and lucid manner. It adopts a student friendly approach to the subject matter with many solved examples and unsolved questions,illustrations and well structured C programs. This book will serve as a stepping stone for students in this course. Salient 1. In-depth coverge on topics such as Graphs, Linked Lists, Arrays etc. 2. Explains run-time complexity of all algorithms 3. Diverse and useful pedagogical features such as illustrations, programs, important commands in programs, key terms etc.