Definition
Mahdism is a belief in a prophesied redeemer (the Mahdi) who will appear to restore justice and righteousness before the Day of Judgment. This figure is central to some Islamic traditions, particularly within Shia Islam. The Mahdi is expected to rid the world of evil and establish a just society. It's like a belief in a messianic figure who will save the world. However, the specific details and interpretations of the Mahdi vary among different Islamic groups. Mahdism often arises during times of social and political upheaval.