Mahdism is a religious belief in Islam that centers around the coming of the Mahdi, a messianic figure who is expected to appear before the Day of Judgment. Followers believe that the Mahdi will restore justice, guide the faithful, and lead a global movement to establish a righteous society. This concept is particularly significant in Shia Islam, where the Mahdi is often identified with the twelfth Imam, Muhammad al-Mahdi. The idea of Mahdism has influenced various movements throughout Islamic history, often emerging during times of social or political turmoil. Different interpretations exist among Sunni and Shia Muslims, leading to diverse beliefs about the Mahdi's identity and role. Overall, Mahdism represents a hope for divine intervention and renewal within the Islamic faith.