Crisis on Infinite Earths was a landmark comic book series, both for publisher DC Comics and the comic book industry as a whole. It solidified the idea of continuity in comics, while also temporarily doing away with superhero media's current favorite trend: the Multiverse. The story is now set to receive an animated adaptation, making it more vital than ever for comic book enthusiasts to read it.
Source:https://www.cbr.com/crisis-infinite-earths-read-dc-comics-before-animated-film-adaptation/