The present work attempts to familiarize the readers with the Shari'ah, the Islamic Legal System. Chapters 1 and 2 define the need for the Shari'ah and explain how a Muslim can live by following the Shari'ah. Shapter 3 is on Taqlid; a process in which the lay Shi'ahs follow the legal opinions of a living mujtahid. Chapter 4 deals with trend of rationalizing every Shari'ah law. Finally, chapter 5 brings the reader closer to the system which a mujtahid uses in reaching to his opinions.