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Ontologies and semantic Web

Ontology is a branch of philosophy that studies the nature of existence and the structure of reality, but on the semantic Web domain ontology “investigates the categories of things that exist or may exist” in a particular domain and products a catalog that details the types of things – and the relations between those types – that are relevant for that domain. This catalog of types is an ontology. In this article, various definitions of ontology, the reasons of our need to ontologies, a sample of an ontology and the role of RDF and RDFS are presented.