Shia is one of the two main branches of Islam, the other being Sunni. Shia Muslims believe that leadership should have stayed within the family of the Prophet Muhammad, specifically with his cousin and son-in-law, Ali. This belief shapes their religious practices and community structure, emphasizing the importance of the Imams, who are considered spiritual leaders and guides. Shia Islam is known for its rich traditions and rituals, including the observance of Ashura, which commemorates the martyrdom of Imam Hussein, the grandson of Muhammad. This event is a significant moment in Shia history, symbolizing the struggle against oppression and injustice.