This book is intended as reference book for students of Science and Engineering. It deals with the I semester of B.Tech. Program of Rajasthan Technical University, Kota and other various Technical University. Fundamentals of Material Science are explained in a very simple and straightforward manner. Also, Many solved and unsolved practice problems are given to understand the contents. The topics covered mainly are bonding in solids; band theory of solids; semicondustors and their conductivity; energy band gap determination and dependence on temperature; X-ray diffraction and Bragg's Law; Hall Effect and its applications.