The largest division of Islam is known as Sunni, which consists of five letters. Sunni Muslims make up the majority of the world's Muslim population and are the most traditionalist of the two major branches of Islam. They believe in the authority of the four major schools of Islamic law and follow the teachings of the Prophet Muhammad. Sunni Muslims also adhere to the five pillars of Islam, which include faith, prayer, charity, fasting, and pilgrimage.