Archive of Our Own (AO3) is a non-profit, non-commercial online archive for transformative fanworks, created by and for fans. A project of the Organization for Transformative Works, it welcomes work inspired by books, music, art, games, television, films, real people, and many other fandoms. The archive offers browsing and search tools for works, bookmarks, tags, collections, and creators, with fandoms spanning categories such as anime and manga, literature, movies, music, theater, and video games.

Users with accounts can publish fanworks, follow updates from favorite works, series, or creators, take part in challenges, and save works to revisit. Membership is available through an automated invitation queue, and the site states that all fans and fanworks are welcome. AO3 also shares news about archive features, community initiatives, and the Organization for Transformative Works.

The provided page identifies itself as a mirror site intended to help users in mainland China access AO3; it is supported by advertising and cautions visitors against suspicious ads requesting downloads or SMS verification