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They are like "continuous" databases. See slides 4-5 here [1] - this is from a talk I had given a while ago.

It helps to think of kqv as a form of look up.

yes, same issue in all transformer tutorials

I suspect this is because most people (including people writing these tutorials) don't have a strong grasp on this piece as well.

The 2b1b video was the first to make it click for me

You mean 3b1b (three blue one brown)?

Ah that's right, miscounted the blues