Islam is a monotheistic religion based on the belief in one God, Allah, and the teachings of the prophet Muhammad. With over 1.8 billion followers worldwide, Islam is the second-largest religion in the world. The core beliefs of Islam are expressed in the Five Pillars, which include the declaration of faith, prayer, charity, fasting, and pilgrimage to Mecca. The Quran, the holy book of Islam, is considered to be the word of God and is the primary source of guidance and inspiration for Muslims. Islam emphasizes the importance of compassion, justice, and respect for all people, regardless of their race, gender, or social status. Its teachings promote peace, unity, and social harmony, while encouraging individuals to strive for spiritual growth and enlightenment.