Certain Muslim is an umbrella term for a variety of religious sects within the Islamic faith. Shiite, Sunni, and SUFI are the three main branches of Islam. Shiite Muslims believe that Ali, the son-in-law of the Prophet Muhammad, was the rightful successor to the Prophet's leadership. Sunni Muslims believe that the first four caliphs were the rightful successors to the Prophet's leadership. Sufis are a mystical branch of Islam that emphasizes the inner spiritual journey and the search for divine love. An EMIR is a leader or ruler in Islamic countries, while an Imam is a religious leader who leads prayers and provides guidance to the community. A SUFI is a follower of the SUFI branch of Islam.