In this episode of our regular Q&A podcast we answer the seemingly simple question, what is ontology? We delineate three thinkers and three notions of the primary philosophical science, out of which only one qualifies as ontology. Those thinkers are Christian Wolff, Aristotle and St. Thomas Aquinas, whereas Wolff is the one who, in 18th Century, introduced ontology as a discipline in the "system of philosophical sciences". We proceed to demonstrate that ontology, as modern invention, is a far cry from what Aristotle and Aquinas considered inquiry into "being qua being" to be. Off course, there are number of random digressions into all kinds of related subjects, from traditional notion of genera/species relation, nature of ens universalis, Kant's blending of metaphysics with Wolffian system and more.