The Book of Islam is a religious text that is composed of two parts, the KORAN and the Quran. The KORAN is the central religious text of Islam, believed by Muslims to be the word of God revealed to the Prophet Muhammad. The Quran is the collection of revelations given to Muhammad by God, which Muslims believe to be the literal word of God. Both the KORAN and the Quran are essential to the Islamic faith and are studied and recited by Muslims around the world.