The "Outer Planes" are a concept in various fantasy and role-playing settings, particularly in Dungeons & Dragons. They represent realms that exist outside the material universe, often embodying different aspects of existence, such as good, evil, law, and chaos. Each plane has its own unique environment, inhabitants, and rules, making them distinct from one another. These planes are often populated by powerful beings, including gods, demons, and angels, who influence the material world. Adventurers may travel to the Outer Planes for quests, seeking knowledge, power, or to confront these formidable entities. The Outer Planes serve as a backdrop for epic stories and adventures.