If Carnosaurids, Dromaeosaurs, etc. are Theropods, what group are Sauropods, Cerotopsians and Hadrosaurs?

Maybe I'm misunderstanding something, but I've been interpreting theropods as mostly the major group of dinosaurs that were bipedal (aside from pachycephalosaurids, and probably others), but what's the major group of dinosaurs that were quadropeds called, like sauropods and hadrosaurs? Thanks for any clarifications!