Fanfiction is a type of creative writing where fans of a particular book, movie, TV show, or other media create their own stories using existing characters and settings. These stories can explore alternative plots, character relationships, or even new adventures that were not part of the original work. Writers of fanfiction often share their stories online through various platforms, allowing others to read, comment, and provide feedback. This form of writing fosters a sense of community among fans, encouraging collaboration and creativity while celebrating their favorite characters and universes.