It varies company to company.
And it can still be "used" and then refurbished.
Like, if you trade in a cell phone, a company could just wipe it down, call it refurbished, and sell it on Amazon as "Amazon refurbished" which makes it sound like a return that was inspected and repaired.
On the other side is "manufacturer refurbished" that is sold direct from manufacturer. Those have been returned for an issue, and likely repaired. Depending on the product, you'd be taking zero chance on a manufacturing flaw and getting a lower price.
But they're likely be scratches and stuff
So, for like a washer/dryer combe, definitely go for manufacturer refurbished. But something where looks matter more than function, the cosmetic damage might not be worth it.