There are approximately 1.2 billion Muslims worldwide, making up around 1/5 of the global population. While only 18% of Muslims live in the Arab world, the largest Muslim populations are found in Indonesia, Pakistan, Bangladesh, India, and Nigeria. The document then provides details on the life and teachings of Muhammad, the main beliefs and practices in Islam including the five pillars of faith, and the religious sites that are central to Islam such as the Kaaba in Mecca.