Wiktionary
n. (alternative spelling of fanart English)
Wikipedia
Fan art or fanart are artworks created by fans of a work of fiction (generally visual media such as comics, movies, television shows, or video games) and derived from a character or other aspect of that work. As fan labor, fan art refers to artworks that are neither created nor (normally) commissioned or endorsed by the creators of the work from which the fan art derives.
A different, older meaning of the term is used in science fiction fandom, where fan art traditionally describes original (rather than derivative) artwork related to science fiction or fantasy, created by fan artists, and appearing in low- or non-paying publications such as semiprozines or fanzines, and in the art shows of science fiction conventions. The Hugo Award for Best Fan Artist has been given each year since 1967 for artists who create such works. Like the term fan fiction (although to a lesser extent), this traditional meaning is now sometimes confused with the more recent usage described above.