Shīʿa Islam is the second-largest denomination of Islam, comprising around 10–15% or more among the total Muslim population. Shīʿa Muslims constitute the majority of the Muslim populations in Iran, Iraq, Lebanon, Bahrain, and Azerbaijan, as well as significant minorities in Syria, Turkey, South Asia, Yemen, and Saudi Arabia, as well as in other parts of the Persian Gulf[
In addition to believing in the supreme authority of the Quran and teachings of Prophet Muhammad(pbuh), Shīʿa Muslims believe that Holy Prophe's family, the Ahl al-Bayt ("People of the Household"), including his descendants known as Imams, have distinguished spiritual and political authority over the community and believe that ʿAlī ibn Abī Ṭālib (pbuh), Holy Prophet's cousin and son-in-law, was the first of these Imams and the rightful successor to Muhammad, and thus reject the legitimacy of the first three Rāshidūn caliphs but respect to them as Sahaba of the Holy Prophet.
Major sub-denominations
List of extinct Shia sects
• The Twelvers believe in the Twelve Shīʿīte Imams and are the only school to comply with the Hadith of the Twelve Successors. It is the most compelet sect among shias. This group is not accepted the other groups of shias.
• Ismāʿīlīsm, including the Nizārī, Sevener, Musta‘lī, Dawudi Bohra, Hebtiahs Bohra, Sulaymani Bohra, and Alavi Bohra sub-denominations.
• The Zaydīs
• The Alawites T
• The Druze
• The Baháʼí Faith