The backstory of made up words

I always find etymology interesting. But here's a case where words in written text were used for typesetting originally. More recently, they have been used to fill in a page, so you can see the page layout (which is a form of modern day typesetting I suppose). 

"Lorem Ipsum" doesn't actually mean anything. So where did it come from?

https://wordsmarts.com/lorem-ipsum/