Warrior Cats is a popular book series written by Erin Hunter, focusing on the lives of wild cats living in clans. Each clan has its own territory, traditions, and leaders, and the stories explore themes of friendship, loyalty, and survival. The series is set in a fictional forest environment, where cats face challenges from other clans, predators, and their own internal conflicts. The series began with the first book, Into the Wild, published in 2003, and has since expanded to include multiple arcs and spin-off novels. Fans of Warrior Cats often engage in discussions, fan art, and role-playing, creating a vibrant community around the series.