Islam is a perfect faith and way of life. It is a complete system in itself, for the life in this world and the next world. For knowing Islam, it is essential to study its philosophy, ideology and principles and for that, one has to approach original sources, viz. Holy Quran and Tradition. This exclusive book is aimed at filling that room. This book successfully covers all important aspects of Islam, as a religion and faith. This Book, namely are: What is Islam? Islam began with the Prophet Muhammad. Islam means "surrender" and its central idea is a surrendering to the will of God. Followers of Islam are called Muslims. Muslims are monotheistic and worship one, all-knowing God, who in Arabic is known as Allah. Followers of Islam aim to live a life of complete submission to Allah. Muslims believe that the last revealed scripture sent by God is the Qur'an. The Qur'an emphasizes moral, ethical and spiritual values with the aim of establishing justice for everyone. The Sunnah is a record of Muhammads words and deeds. The Sunnah is used to help interpret the Quran. There is also instruction in it on belief, worship and behaviour. The five pillars are each described in some part of the Qur'an and were already practiced during Prophet Muhammad's lifetime. Present work, a comprehensive book is an effort for undertaking Islamic Studies in nutshell, authentically. This comprehensive study, in an interesting manner, has culminated into an exhaustive and exclusive work, on the subject. Beyond normal parameters, it is bound to serve all its users. It is an asset for all scholars, scientists, teachers, researchers and students, of course.