The "New 52" was a major initiative launched by DC Comics in September 2011, which rebooted its entire comic book line. This initiative introduced 52 new ongoing series featuring popular characters like Batman, Superman, and Wonder Woman, while also reimagining their backstories and relationships. The goal was to attract new readers and modernize the brand. The "New 52" lasted until 2015, when it was replaced by the "DC Rebirth" initiative. During its run, the series received mixed reviews, with some fans appreciating the fresh takes on characters, while others criticized the changes to beloved storylines and histories.