"The Foundation Trilogy," written by Isaac Asimov, is a science fiction series that explores the rise and fall of a galactic empire. The story follows Hari Seldon, a mathematician who develops a theory called psychohistory, which predicts the future of large populations. To mitigate the impending dark age, he establishes the Foundation, a group tasked with preserving knowledge and culture. The trilogy consists of three main books: Foundation, Foundation and Empire, and Second Foundation. As the narrative unfolds, various characters and factions vie for power, while the Foundation's mission faces numerous challenges. The series delves into themes of history, politics, and the cyclical nature of civilizations.