The basic objective of this book is to bridge the gap between the vast contents of the reference books, written by the renowned Intertiol Authors and the concise requirements of Undergraduate Students. This book has been written in a comprehensive manner using Simple and Lucid language, keeping in mind students' requirements. The main emphasis has been given on exploring the basic concepts rather than merely the Information. Solved Examples, Summary and Exercises have been provided throughout the book and at the end of the Unit. Also I have given Model Question Papers for practice at the end of book.