The Foundation Series is a collection of science fiction novels written by Isaac Asimov. It explores the rise and fall of a vast galactic empire, focusing on the concept of psychohistory, a mathematical way to predict the future of large populations. The story follows the efforts of Hari Seldon, a brilliant mathematician, who seeks to save civilization from impending collapse by establishing a foundation of knowledge. Throughout the series, readers encounter various characters and factions as they navigate political intrigue and the struggle for power. The themes of knowledge, history, and the cyclical nature of civilizations resonate throughout the narrative, making it a timeless classic in the genre.