Definition
What distinguishes a fictional universe from a simple setting is the level of detail and internal consistency. A fictional universe has an established continuity and internal logic that must be adhered to throughout the work and even across separate works. So, for instance, many books may be set in conflicting fictional versions of Victorian London, but all the stories of Sherlock Holmes are set in the same Victorian London. However, the various film series based on Sherlock Holmes follow their own separate continuities, and so do not take place in the same fictional universe.
The history and geography of a fictional universe are well-defined, and maps and timelines are often included in works set within them. Even languages may be constructed. When subsequent works are written within the same universe, care is usually taken to ensure that established facts of the canon are not violated. Even if the fictional universe involves concepts such as magic that don't exist in the real world, these must adhere to a set of rules established by the author.
A famous example of a fictional universe is Arda, of J. R. R. Tolkien's books The Lord of the Rings and The Silmarillion. He created first its languages and then the world itself, which he states was "primarily linguistic in inspiration and was begun in order to provide the necessary 'history' for the Elvish tongues."
Another, more recent, famous fictional universe is that of the Avatar film series, as James Cameron has invented an entire ecosystem, with a team of scientists to test whether it was viable. Also, he commissioned a linguistics expert to invent the Na'vi language.
Virtually every successful fictional TV series or comic book develops its own "universe" to keep track of the various episodes or issues. Writers for that series must follow the story bible, which often becomes the series canon.
Frequently, when a series gets too complicated or too self-inconsistent (because of, for example, too many writers), the producers or publishers will introduce retroactive continuity (retcon) to make future editions easier to write and more consistent. This creates an alternate universe that future authors can write about. These stories about the universe or universes that existed before the retcon are usually not canonical, unless the franchise-holder gives permission. Crisis on Infinite Earths was an especially sweeping example.
Some writers choose to introduce elements or characters from one work into another, to present the idea that both works are set in the same universe. For example, the character of Ursula Buffay from American sitcom Mad About You was also a recurring guest star in Friends, despite the two series having little else in common. Fellow NBC series Seinfeld also contained crossover references to Mad About You. L. Frank Baum introduced the characters of Cap'n Bill and Trot (from The Sea Fairies), into the Oz series in The Scarecrow of Oz. The two characters made a number of subsequent appearances in later Oz books.
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