An ontology and a knowledge graph are related concepts, but they serve different purposes and have different characteristics.
An ontology is a formal, explicit specification of a shared conceptualization of a domain of interest. In other words, it is a model of the concepts and relationships that exist within a particular domain, typically represented using a formal language such as RDF or OWL. Ontologies are used to represent knowledge in a structured and standardized way, making it easier to reason about and share information within a community.
A knowledge graph, on the other hand, is a specific implementation of a graph database that is used to represent and store knowledge. It typically consists of a set of nodes representing entities, and a set of edges representing the relationships between those entities. Knowledge graphs are often used to represent and store large amounts of heterogeneous data from multiple sources, making