Book is the best friend a human being can ever have. Book is that friend who can never go cheating or can never be disloyal. These books make our life easy to lead as they inform us about various ways of leading our very over life. Books are informative and some times instructive. An individual is never going to feel alone in the presence of books. In the company of books, a person is never going to feel the boredom of daily routine if he has nothing else to do. Books have many wonders in it and they make a person absorbed in their interesting content. The best example of being a friend of books can be realized while long journeys when a person has nothing to do expect to sit and wait for his/her destination. The reading of an interesting book shortens the distance and time that is in between. Books are of many kinds & for many subjects such as psychology, philosophy, English, finance, business, computers, biology, zoology, botany, international relation, history, science accounting, mathematics, sociology, economics, communication, networking, designing, management, political science, administration, astronomy, education, astrology, geography, marketing, pharmacy, etc, thus teacher's assign students to write essays on book as main exercise.