The study of data structures and algorithms is very important for the students of computer science. The topic on data structures is an essential part of course curricula in various undergraduate and graduate programmers in computer science. The study of data structures and algorithms is very important for the students of computer science. The topic on data structures is an essential part of course curricula in various undergraduate and graduate programmers in computer science. The present text lays emphasis on theory and design of data structures, and their implementation using C language. The organization chosen is different from most other books on this subject. Most of the present books either deal with the theoretical concepts in data structures, but ignore their design and implementation aspects or lays very little stress on theoretical concepts and shows their implementation straight away. In that situation, the readers have to consult number of books. The present text fills this gap. The reader will be able to get each and every thing required for the study of data structures under one shelf.