In this book, the basics of Computer Science and Information Technology are presented in such a manner so that a beginner can find this book fully tailored to his /her requirements and the one who is already in this field will find it more informative. The book presents each concept in a very simple and easy to understand language with the help of relevant examples. It not only covers the basic concepts of computer Engineering but also provides knowledge of multidisciplinary Informatics to increase the knowledge of the reader. Therefore, this book is beneficial for all the students of Indian Universities like Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal-Madhya Pradesh, Rajasthan Technical University Kota, University of Rajasthan Jaipur, and UP Technical University; pursuing the courses of Engineering like B.Tech, MCA, etc. This book also covers the latest curriculums of CSIT & IS in Universities like Monash University Melbourne, Australia, Mekelle University, Addis Ababa University, American University Cairo, University of Science and Technology Sana and AM Institute of Technology University.