The DC Extended Universe (DCEU) is an American media franchise and shared universe centered on a series of superhero films produced by DC Studios and distributed by Warner Bros. Pictures. It is based on characters that appear in American comic books published by DC Comics. The DCEU also includes comic books, short films, novels, and video games. Like the original DC Universe in comic books, the DCEU is established by crossing over common plot elements, settings, cast, and characters.

A shared universe or shared world is a fictional universe from a set of creative works where one or more writers independently contribute works that can stand alone but fits into the joint development of the storyline, characters, or world of the overall project. It is common in genres like science fiction. It differs from collaborative writing in which multiple artists are working together on the same work and from crossovers where the works and characters are independent except for a single meeting.