Fan fiction refers to a type of literature that is written by fans of a particular book, movie or TV show. It typically involves creating new stories using characters and settings from an existing work, often expanding on the plot lines or exploring alternative scenarios. Fan fiction can be found in various forms such as novels, short stories, poetry, artwork, and videos, and is usually shared among fans online through websites, forums, and social media platforms. The term "fan fiction" also refers to any written work that is derived from an existing work but not necessarily based on the original characters or settings.