There are many varieties of ribs. Most ribs are bone-in, with the exception of country and western style ribs. Varieties of pork ribs include Spareribs, Baby Back Ribs, Country Style Ribs, St. Louis Ribs and Western Ribs.
Country or western style ribs are shoulder cuts which naturally contain more fat than ribs cut form a pork loin. Pork back ribs are the most tender of all the rib varieties because they come from the pork loin.