Muslims are followers of Islam, a monotheistic religion that believes in one God, known as Allah. The teachings of Islam are based on the Quran, which is considered the holy book, and the sayings of the Prophet Muhammad. Muslims practice their faith through the Five Pillars of Islam, which include faith, prayer, charity, fasting, and pilgrimage. Globally, there are over 1.9 billion Muslims, making Islam the second-largest religion in the world. Muslim communities can be found in diverse cultures and regions, from the Middle East to Southeast Asia, and they contribute significantly to the social, cultural, and economic fabric of their societies.