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'''Ontology''' is the philosophical study of beingthe philosophical study of [[being]]. More broadly, it studies [[concepts ]] that directly relate to being, in particular becoming, existence [[existence]], reality [[reality]], as well as the basic categories basic [[categories]] of being and their relations. Traditionally listed as a part of the major branch of [[philosophy ]] known as metaphysicsas [[metaphysics]], ontology often deals with questions concerning what entities exist what entities [[exist]] or may be said to exist and how such entities may be grouped, related within a hierarchy, and subdivided according to similarities and differences.