In the Dungeons & Dragons role-playing game, an adventure or module is a pre-packaged books or box sets that help the Dungeon Master to manage the plot or story of a game. The term adventure is currently the preferred term. In early editions of the game these publications were commonly referred to as modules, which stems from the term dungeon module, used to refer to the earliest adventures published by TSR, with other variations on the module name appearing on latter adventures. The term module continued to be popular among players of the original Dungeons & Dragons and Advanced Dungeons & Dragons even after newer publications were labeled adventure. Adventures that appear as a part of a larger accessory are often referred to as scenarios. The exact differences between the terms adventure, module, scenario, and accessory are hard to precisely define in Dungeons & Dragons terminology, as they all have been used in different ways.