The "Shannara" series is a collection of epic fantasy novels written by Terry Brooks. It is set in a post-apocalyptic world where magic and mythical creatures coexist with remnants of human civilization. The story often follows the adventures of various characters from the Ellcrys tree, which plays a crucial role in maintaining the balance between good and evil. The series began with "The Sword of Shannara," published in 1977, and has since expanded to include multiple trilogies and standalone novels. Key themes include the struggle between light and darkness, the importance of family, and the quest for identity. The series has also been adapted into a television show, further popularizing the Shannara universe.