What is Marvel Multiverse...???

The Multiverse is the collection of alternate universes that share a universal hierarchy.Within Marvel Comics, most tales take place within the fictional Marvel Universe, which in turn is part of a larger multiverse.
So there are lot of universe defined in comics.But Earth-616 is the established main universe where the majority of Marvel stories take place.
But also other universe too...such as-
Ultimate Universe,MC2(What If...)universe,Noir ,Marvel2099.
And now video format universe are also available- MCU, Animated Marvel Universe.
All these together form a multiverse of Marvel Comics.
Soo here are some famous & most widely used universes with so details about it-

1)Earth-616 (Marvel Universe): Reality of the all original Marvel Super Heroes and its mainstream continuity is persent in this universe. Differences between other universes are usually described in comparison with Earth-616.So it is the main universe of Marvel Comics.The Marvel Comics company itself exists within the Marvel Universe, and versions of people such as Stan Lee and Jack Kirby have appeared in some of the stories.

2)Earth-311 (Marvel 1602):Earth-311 is an Medieval age storyline in which Marvel heroes of the Silver Age of Comic Books have been awakened 400 years early in England.Also included are historical figures, such as the monarchs Elizabeth I and James I of England, William Shakespeare and Virginia Dare, the first English child born in America.The Age of Marvels began during Queen Elizabeth's reign. Elizabethan versions of many Marvel heroes banded together. Mutants exist, but they are most commonly referred to as the "witchbreed".
However, when events transpire at the end of the series, the 1602-verse lives on in Uatu's pocket dimension.

3)Earth-1610 (Ultimate Marvel): Ultimate Marvel is in Ultimate Universe. It is reinvention of the Marvel Universe for the modern age. Home reality of The Ultimates Heroes such as Ultimate Spiderman(Miles Morales),Ultimate Fantastic Four,Ultimate X-Men, Ultimate Thor & the other ultimate version of  many heroes.
But the ultimate universe came to an end at the conclusion of Secret Wars when it was destroyed alongside all the other alternate realities in the multiverse, and then recreated as a region of the Battleworld. Soo some selected characters from the Ultimate Universe moved to the mainstream universe.

4)Earth-928(Marvel 2099): It is the alternate future of Earth-616 set in 2099, with futuristic incarnations of Marvel heroes, villains and teams. It has been confirmed to be a possible future version of Earth-616.
The heroes & villans are highly futuristic advanced. Soo the characters are Fantastic Four 2099,Daredevil 2099, Doom 2099, Punisher 2099, and Spider-Man 2099.
The world of 2099 is a cyberpunk dystopia.North America is a corporate police state ruled by a few huge megacorporations(Alchemax).
Miguel O'Hara(Spiderman2099)assembled various 2099 heroes into a new team of Avengers.The story summarized the years from 2099 to 3099, with humanity transforming the corporate world of 2099 into utopia and expanding into space.

5)Earth 982(MC2): It is an alternative future timeline for the Marvel Universe. The imprint was spin off from the events of What If?. Most Marvel heroes having taken place fifteen years earlier than in main continuity.
It contains characters such as Spider-Girl,Wild Thing(daughter of Wolverine & Electra),J2(son of jagguernaut),& some teams like A-Next(AVENGERS) & Fantastic Five. This universe mainly focused on Spider-Girl.

6)Earth 2149(Marvel Zombies): The series features zombie versions of Marvel Universe superheroes and supervillains who have been portrayed as both protagonists and antagonists.It contains all Marvel characters but infected by zombie virus.But origin of the infection is unknown.

7)Earth 90214(Noir Marvel): A universe where local counterparts of Earth-616 superhumans debuted in the 1920s and 1930s. Most Superpowers are mainly unknown at this point, though with the certain exceptions of few, such as Spider-Man (who received his powers from a mystical "Spider God"), Luke Cage, and Daredevil.

8)Earth-8311(Larval Universe):Home reality of Peter Porker, the spectacular Spider-Ham and anthropomorphic funny-animal parodies of the other Marvel characters.

9)Earth-199999(Marvel Cinematic Universe):It is an American media franchise and shared universe that is centered on a series of superhero films, independently produced by Marvel Studios and based on characters that appear in Marvel Comics.

10)Earth-12041:Universe of the animated series featured on Disney XD.Setting of series of Ultimate Spider-Man, Avengers Assemble, Hulk and the Agents of S.M.A.S.H. and Guardians of the Galaxy.