We have great pleasure in presenting the First edition of this book. "FUNDAMENTALS OF COMPUTERS" is a core subject for B-Tech, BE, BSc, MCA, BCA and Diploma Students for interring the computer technology. This book is primarily intended to serve as a textbook in according with syllabus of Computer fundamental offered by various universities in India as well as abroad. Fundamentals of Computers is a movement started sometime during the middle of the first decade of the new millennium; the movement is motivated by the idea that information processing can be done more efficiently on large farms of computing and storage systems accessible via the Internet. The resources used for these services can be metered and the users can be charged only for the resources they used.