In American South cuisine
Spare ribs have also become popular in the American South. They are generally cooked on a barbecue or on an open fire, and are served as a slab (bones and all) with a sauce.
Basted spare ribs on an outdoor grill
Pork spare ribs are taken from the belly side of the pig's rib cage above the sternum (breast bone) and below the back ribs which extend about 6" down from the spine. Spare ribs are flatter than the curved back ribs and contain more bone than meat. There is also quite a bit of fat which can make the ribs more tender than baby back ribs.
Beef short ribs are taken from the belly side of the cattle's rib cage above the sternum (breast bone). Beef spare ribs tend to be longer, wider, and sometimes more curved than their pork counterparts, and are cut from the prime rib rump, of which the thicker boneless part becomes the ribeye steak, and the upper tips of the ribs are then cut off and become short ribs.
(https://en.wikipedia.org/wiki/Spare_ribs)