Data Structures Using in C is a comprehensive and student-friendly textbook designed for B.Sc (Computer Science) Semester–II students as per the CBCS syllabus (w.e.f. 2025–2026). The book provides a clear, structured and simplified approach to understanding both linear and non-linear data structures, making it ideal for beginners as well as intermediate learners. It covers all essential concepts including arrays, stacks, queues, linked lists, trees, graphs, hashing, searching, and sorting, with each topic explained through definitions, diagrams, algorithms, solved examples, and C programs. Prepared by experienced lecturers from Government Degree Colleges in Telangana, the book ensures accuracy, conceptual clarity, and practical insight to help students strengthen their foundational knowledge in programming and problem-solving. With unit-wise explanations, important questions, and lab experiments aligned with the university syllabus, this book serves as a reliable resource for examinations, classroom learning, and self-study.