What is Ontology? Quote from Wikipedia "is the philosophical study of the nature of being, existence or reality in general, as well as the basic categories of being and their relations....ontology deals with questions concerning what entities exist or can be said to exist, and how such entities can be grouped, related within a hierarchy, and subdivided according to similarities and differences" Quote from other web-site "In ancient times, Ontology referred to study of Being and fell into disrepute...