The Arrowverse represents a very important period during DC's history on screen. The ambitious television universe was a major rival to what DC was doing in cinemas but also served as a vital testing ground for new tropes, concepts, characters, and arcs. The Arrowverse adapted and produced so many major beats far before the DCEU ever did and, indeed, has begun to pave the way for the DCU too.
Source：https://www.cbr.com/arrowverse-dceu-tropes-multiverse/
