This book is specially designed to serve as textbook for the students of various streams such as PGDCA, B.Tech./B.E., BCA, BSc M.Tech./M.E., MCA, MS and cover all the topics of data structure. The subject data structure is of prime importance for the students of computer Science and IT. It is practical approach for understanding the basics and concepts of data structure. All the concepts are implemented in C language in an easy manner. To make clarity on the topic, diagrams, examples and programs are given throughout the book. This book is especially designed for beginners, explains all basics and concepts about data structure. Source code of all data structures are given in C language. Important data structures like stack, queue, linked list, tree and graph are well explained. Solved Example, frequently asked in the examinations are given which will serve as a useful reference source. Effective description of sorting algorithm (quick sort, heap sort, merge sort etc.) CD contains all programming codes in ‘C’.