They can be dry or wet. This has a base of the dry rub. Title specifies wet. https://en.wikipedia.org/wiki/Memphis-style_barbecue

Memphis-style barbecue is slow cooked in a pit and ribs can be prepared either “dry” or “wet”. “Dry” ribs are covered with a dry rub consisting of salt and various spices before cooking and are normally eaten without sauce. “Wet” ribs are brushed with sauce before, during, and after cooking.

Memphis-style barbecue is mostly made using pork.

I’d love to try them slow smoked, eventually. I totally want a smoker at home. But for me, the slow cooker was accessible. I finished it on a charcoal BBQ for the final 20 minutes per rack.