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Worldbuilding is the process of constructing an imaginary world, usually associated with a fictional universe. The result may sometimes be called a constructed world, conworld or sub-creation. The term world-building was popularized at science fiction writer's workshops during the 1970s. It describes a key role in the task of a fantasy writer: that of developing an imaginary setting that is coherent and possesses a history, geography, ecology, and so forth. The process usually involves the creation of maps, listing the back-story of the world and the people of the world, amongst other features. Worlds are often created for a novel, video game, or role-playing game, but sometimes for personal enjoyment or its own sake (see geofiction).
A constructed world typically has a number of constructed cultures and constructed languages associated with it. Constructed worlds often provide additional backstory and history to events in novels. Authors typically revise constructed worlds to complete a single work in a series.