Can someone explain MOON as if I was a 5 year old?

I saw that some people have MOON written next to their profile name on comments and posts. I was wodnering how they got them. A friend told me that I should create a vault first, so I did. However, I have 0 clue on how to get MOON.

Also, what can you use MOON for?

Before you downvote me to the MOON, yes I did read the Reddit wiki on this and couldn't figure it out. Honest question here.

Hope you can help a MOON noob out. Thank you!

Edit: I saw a comment below saying I did this to farm MOON. And this just got me wondering. Are MOONs actually creating some sort of paranoia from upvoting posts/comments?

I'm saying this because the post has 120 comments but only 15 upvotes. I don't mind it at all since I got more answers than I even wished for (thank you all for that). But it just seems weird and got me wondering. Anyone has an opinion on this?

submitted by /u/crxv20
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