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If something is in-universe, it exists within the DC Universe. Characters, locations, and items are examples of in-universe things.
If something is out-of-universe, it exists in the real world. Writers, illustrators, and specific issues of comics are examples of out-of-universe things.
In-universe articles should be written from the perspective of a resident of the DC Universe. There should be no mention that any of the topics are fictional, except perhaps in a separate section at the bottom of the article. Wikipedia articles are a great source of information for the DCDP, but they are written from an out-of-universe perspective and should be thorougly edited before becoming a part of this project. Instead of saying "Superman was a fictional character from Krypton", you would say "Superman was from Krypton", for example.