The difference between Shiite Muslims and Sunni Muslims is

Sunni Muslims are the majority in most Islamic countries outside of Iran, Iraq, Yemen, and Bahrain. Sunna-translated variously as the "trodden path," "the way," "example," or "habitual practice"-refers to the example or path of the Prophet Muhammad and his followers.

Shiite Muslims branch believes that the first four caliphs--Mohammed's successors--rightfully took his place as the leaders of Muslims. They recognize the heirs of the four caliphs as legitimate religious leaders. These heirs ruled continuously in the Arab world until the break-up of the Ottoman Empire following the end of the First World War.