Islam is a religion of the fundamental doctrines and dogmatic (undeniable) faith. Its the main source of principles and rituals is the Holy Quran and Prophet Muhammed’s (sal) traditions (Ahadis). To assimilate the essential requirements of the Islamic faith is on the basis of understanding the terminology and the important events, which create the subjective and objective ways of the religion. The Quran was descended in Arabic, and the Prophet’s mother tongue was also Arabi, so almost the Islamic terminology is in Arabic. Therefore, it is necessary to understand some important Arabic terms and their effective denotation to rightly fulfil the religious rituals and practices. This book also contains the work of the religious noblemen and the political personalities who have worked to spread Islamic faith, and there has been given the introductory knowledge of the important wars, which were fought under the Islamic flag against the enemies of the nascent faith