What is the significance of Imam Mahdi in Sunni Islam and how does his role impact the beliefs and practices of Sunni Muslims?

Imam Mahdi is a significant figure in Sunni Islam as he is believed to be a messianic figure who will appear before the Day of Judgment to establish justice and righteousness on Earth. His role impacts the beliefs and practices of Sunni Muslims by instilling hope for a better future, encouraging them to uphold moral values, and reminding them to be prepared for his arrival by living virtuously and following Islamic teachings diligently.