Why was AOTY a big thing for Beyoncé?

Don’t get me wrong, I love her music and she’s an amazing artist and performer (my first ever concert was during the lemonade tour which was absolutely incredible)!!

I’m just sorta unfamiliar with the Grammys as a whole and how all that works, but I know she’s got lots of Grammys, so I’m curious as to what makes album of the year so significant?