Where does almond milk come from, anyway? Always been curious

almond milk is basically just blended up almonds that have been filtered

https://www.thekitchn.com/how-to-make-almond-milk-at-home-cooking-lessons-from-the-kitchn-189996
This tells you how it is made.
I hate almond milk but I have relatives who can't have any kind of dairy so I get why it was made.