Do you need proofreading or editing?

As a freelance writer, editor and translator, I'm usually asked to edit text. But occasionally, I'm asked to "proofread" it. But whenever I get this request, I insist on seeing a copy of the text, so I can gauge if the text requires editing or proofreading. Quite frankly, most people don't know the difference between the two and I don't blame them. I mean, unless you're in the publishing business, you rarely have to go through the process of editing, proof reading, copyediting and so on. So what's the difference? I found a great online article by Upwork that explains just that :)  Hope this helps!