This third edition of Data Structures using C is a comprehensive textbook for undergraduate engineering students of computer science as well as postgraduate students of computer applications to understand the fundamental concepts of data structures and their implementation in C programming language. The book covers all the essential topics of data structures, including arrays, linked lists, stacks, queues, trees, and graphs, providing readers with a thorough understanding of each concept's strengths and limitations. With clear explanations and easy-to-follow code examples, this book is perfect for students and professionals seeking a solid foundation in data structures and their applications. The book utilizes a systematic approach wherein the design of each of the data structures is followed by algorithms of different operations that can be performed on them, and the analysis of these algorithms in terms of their running times.