This book bearing the titled on “DATA STRUCTURES”. Data Structure plays a fundamental role in almost every aspect of computer science and is found in almost every nontrivial computer program. This book tells an Abstract Data Type (ADT), list, singly linked list, doubly linked list on the basis of linked list, trees and balanced trees. In addition to encompassing sufficient methods and relevant program with example trees and structures. I enthusiastically believe that the governess as well as the taught will benefit much and find that this book is a sure road to success.