Islam is a great religious tradition, the second largest and fastest growing of the World’s Religions, embracing some 57 Muslim countries and is the second or third largest religion in Europe and America. Despite the global achievements of Islam as a faith and civilization, since the Iranian Revolution, Islam has been viewed through the lens violence and the actions of militant terrorists. John L. Esposito, Professor of Religion and International Affairs and of Islamic Studies at Georgetown, addresses the questions: Who are Muslims and what do they believe? What do Islam, Judaism and Christianity share in common? Why does it matter?