While not formally described as such, Signature dining tends to be slightly more "upscale" - in that the menus are supposed to be a little more "fancy" than your typical restaurant (this does not include the dinner shows or CRT). The menus does tend to be more expensive, but they include items like lobster, filet mignon, etc. Also, the Signature restaurants (again not including the dinner shows or restaurants in a park) have a dress code (things like no swimwear, etc.).