Avengers: Endgame's backstory encompasses a lot. It ties together the loose ends from previous installments, showing how the heroes were affected by past battles and how they prepared for the ultimate showdown with Thanos.
Sure is. The movie draws inspiration and elements from the rich world of Marvel Comics, specifically those related to the Avengers and their adventures.
Avengers: Endgame wasn't initially a comic. It was a highly anticipated and spectacular movie that capitalized on the popularity and rich history of the Marvel Comics. While it may have shared similarities and concepts with the comics, it was a standalone cinematic creation that thrilled audiences worldwide.
In Avengers Endgame, the remaining Avengers are dealing with the aftermath of Thanos' snap. They come up with a plan to time - travel to get the Infinity Stones before Thanos does. They split into teams and travel to different points in time. There are many great battles and emotional reunions. In the end, they manage to reverse Thanos' actions and defeat him once and for all.
Avengers: Endgame has elements that can be traced back to the comics. However, there are also significant differences and adaptations made for the movie version.