What does ❓from scratch mean?

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At the grocery store in America, you could see boxes that have cake mix, chocolate chip cookie mix, all kinds of mixes.. All you might have to do is add water, butter, oil, and/or maybe eggs. You stir everything together, and voila, put little balls of dough on the cookie sheet, bake the cookies, and you're done. That's not baking from scratch. It's less common, but with some mixes all you need to do is add water, just to give you an even better idea of what I mean, what baking from scratch is not.

Baking from scratch means that you measured, and added all of the individual ingredients yourself. You did not buy some mix that already has everything in a plastic bag.

Someone else will probably have a better explanation, but that's the best I got right now.