system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] So what exactly IS Yggdrasil?

In Norse mythology it's a literal tree with some magica-mystica to it, and in the comics there's some elements of that. But in the movies, we never hear anything about it except from a brief description in Thor 1. By Ragnarok, Hela's description of the Nine Realms is just that "Odin stopped at 9 because reasons," which would indicate that the "World Tree" is just a poetic description of things. But in The Dark World the Convergence indicates that there *is* something significant about those 9 in particular, because it's *their* alignment that causes those gravity anomalies and that Malekith can use to destroy them. So there's got to be some fact behind this "World Tree" idea, but what is the reality of it?
gpt
From the right dimension it actually looks as a tree. Our minds can’t comprehend what it is so we get an interpretation.

Kind of the same how galactus looks different to each alien race.

That tree actually stands for a complicated interdimensional connection system. It’s not just about getting from realm to realm. There needs to be a balance between the realms. If the balance is tipped too far. All suffer causing the connections to deteriorate and eventually break down. And that would spell doom for all.