Fan fiction or fanfiction (also abbreviated to fan fic, fanfic, fic or ff) is fictional writing written in an amateur capacity by fans, unauthorized by, but based on an existing work of fiction. The author uses copyrighted characters, settings, or other intellectual properties from the original creator(s) as a basis for their writing. Fan fiction ranges from a couple of sentences to an entire novel, and fans can both keep the creator's characters and settings and/or add their own. It is a form of fan labor. Fan fiction can be based on any fictional (and occasional non-fictional) subject. Common bases for fan fiction include novels, movies, musical groups, cartoons, anime, manga, and video games.
Fan fiction is rarely commissioned or authorized by the original work's creator or publisher and is rarely professionally published. It may infringe on the original author's copyright, depending on the jurisdiction and on legal questions such as whether or not it qualifies as "fair use" (see Legal issues with fan fiction). Attitudes of authors and copyright owners of original works to fan fiction have ranged from indifference to encouragement to rejection. Copyright owners have occasionally responded with legal action.
The term came into use in the 20th century as copyright laws began to delineate between stories using established characters that were authorized by the copyright holder and those that were not.Fan fiction is defined by being related to its subject's canonical fictional universe, either staying within those boundaries but not being of the canon itself, or else branching outside of it into an alternative universe. Thus, what is "fanon" is separate from what is canon. Fan fiction is often written and published within circles of fans, and therefore would usually not cater to readers who have no knowledge of the original fiction.
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