OWL

Web Ontology Language
OWL (Ontology Language) is a Semantic Web  language designed to represent a understanding information, groups of information, and relations between all of the information. OWL is a computational logic-based language such that knowledge expressed in OWL can be exploited by computer programs. OWL documents, known as ontologies, can be published in the World Wide Web and may refer to or be referred from other OWL ontologies. OWL is part of the W3C’s Semantic Web technology stack, which includes RDF, RDFS, SPARQL , etc.