Not the Marvel Cinematic Universe of films.
The MCU overwrote the main Marvel Universe because Marvel didn’t have the rights to most of their characters, used what was left of the roster and made that the main universe, publicized smaller characters for a profit, improvised new ones, and cobbled together all the existing franchises in Marvel history in an attempt to remake all the characters again.
At this point, I don’t know anymore what is the true Marvel universe because of the MCU tarnishing the goodwill of the comic books.
And why go through so much trouble to make a movie when you’re a comic book publisher?
The 616 Universe as always, the MCU has its own ridiculously long number I dont remember, but for some reason in the movies they say they are 616. But it is, and has always been, Earth-616 and the universe in which she resides.