FanFiction.Net (often abbreviated as FF.Net or FFN) is an automated fan fiction archive site. It was founded in 1998 by Los Angeles computer programmer Xing Li, who also runs the site. As of 2010^[update], FanFiction.Net is the largest and most popular fan fiction website in the world. It has nearly 2.2 million users and hosts stories in over 30 languages.

The site is split into nine main categories: Anime/Manga, Books, Cartoons, Miscellaneous, Games, Comics, Movies, Plays/Musicals, and TV Shows. As of March 27, 2009, a new feature was added to the site - the Crossover categories. Users who complete the free registration process can submit their fan fiction, maintain a user profile, review other stories, apply for a beta reader position, contact each other via email or private messages, and maintain a list of favorite stories and authors. There are also centralized communities and forums.

In 1998 Xing Li, a software designer in Los Angeles, created FanFiction.net. The site was created as a repository for fan-created stories that revolved around characters from popular literature, television, comics, or real-world celebrities. Unlike other fan fiction sites, FanFiction.Net allowed stories about any characters rather than revolve around a specific set of characters, such as those from Naruto, Harry Potter or Kingdom Hearts. Registration was open to all people who claimed to be over 18, and by 2002 over 118,000 people were registered. (The age limit has since been moved down to 13.) At that time, one-third of the registrants self-identified as 18 or younger, and 80% were female.

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A Mary Sue (sometimes just Sue), in literary criticism and particularly in fanfiction, is a fictional character with overly idealized and hackneyed mannerisms, lacking noteworthy flaws, and primarily functioning as a wish-fulfilment fantasy for the author or reader. It is generally accepted as a character whose positive aspects overwhelm their other traits until they become one-dimensional. While the label "Mary Sue" itself originates from a parody of this type of character, most characters labelled "Mary Sues" by readers are not intended by authors as such. Male Mary Sues are often dubbed "Gary Stu", "Larry Stu", "Marty Stu", or similar names.

While the term is generally limited to fan-created characters, and its most common usage today occurs within the fan fiction community or in reference to fan fiction, original characters in role-playing games or literary canon are also sometimes criticized as being "Mary Sues" or "canon Sues" if they dominate the spotlight or are too unrealistic or unlikely in other ways. One example of this criticism is Wesley Crusher from Star Trek: The Next Generation.