“Allah” is the Arabic word for God in Islam. Muslims believe that Allah is the one and only God, the creator and sustainer of the universe. The concept of Allah is central to Islamic theology, and Allah is described as being merciful, compassionate, and just. In Islamic practice, the five pillars of faith guide Muslims in their worship and life, emphasizing their devotion to Allah. The Quran, which is the holy book of Islam, contains the revelations given to the Prophet Muhammad by Allah.