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There is an interesting overlap between what is considered a ``knowledge graph'' and what is an ontology.  The most commonly accepted definition of an ontology is a ``an explicit specification of a conceptualization'' \cite{Gruber_1993}.  To a large degree, knowledge graphs conform to this definition, but generally ontologies tend to talk about generalities (classes, properties, and roles) instead with less focus on inclusion  of content about  specific instances. Few For example, most  ontologies that include content related to descriptions of world landmarks would have descriptions of the landmark class and its related properties but  would typically not include a  mention of  the Eiffel Tower, but a knowledge graph that covers the domain of Parisian landmarks would. Conversely, knowledge graph approaches can be used to improve the credibility of ontologies by encoding the epistemology of the statements in the ontology.