Muad'Dib is the name taken by Paul Atreides, the central character in Frank Herbert's science fiction novel series, Dune. He is the son of Duke Leto Atreides and Lady Jessica and becomes a key figure in the struggle for control over the desert planet of Arrakis, which is the only source of the valuable spice, melange. As Muad'Dib, Paul rises to power among the native Fremen people, who view him as a prophesied leader. His journey involves mastering the unique challenges of Arrakis, including its harsh environment and political intrigue, ultimately leading to significant changes in the universe's balance of power.