The "Dune Trilogy" refers to the first three novels in the Dune series written by Frank Herbert. These books include Dune, Dune Messiah, and Children of Dune. Set in a distant future, the story explores themes of politics, religion, and ecology on the desert planet of Arrakis, known for its valuable resource, spice. The trilogy follows the journey of Paul Atreides, a young nobleman who becomes embroiled in a complex struggle for power. As he navigates the challenges of leadership and prophecy, the series delves into the consequences of his rise and the impact on the universe around him.