How does the flash relate to the dc extended universe timeline?

The DC Extended Universe (DCEU) is a shared film universe that debuted in 2013 with Man of Steel and has grown to include Batman, Wonder Woman, and other characters. It was established by crossing over common plot elements, settings, cast, and characters, similar to the original DC Universe in comics. The Flash serves as the point where the DCEU crossed over with separate timelines from other DC‑licensed film series, creating a "multiverse" that expands the overall timeline and connects disparate film franchises.