How is Prime Rib different from Roast Beef?

Are they the same?

Prime rib refers to a whole or large cut of rib eye roasted then sliced and served. Roast beef can be any cut from the cow.

Prime can also be used to describe the quality of the particular cut. Prime, choice, and select in that order are the 3 top qualities. After select it’s only fit for ground beef and dog food.