The vast content of the World-Wide Web is used by millions of people. Many users use a search engine to start their business on the Web. The query is usually a list of keywords, and the result returned is also a list of Web pages that may or may not be relevant, typically pages that contain the keywords [4]. Today's Web does not have metadata that can be read by other computers. Metadata is data about data, so it would be possible to distinguish between 1984 (a number), 1984 (a date), 1984 (a film starring John Hurt) and 1984 (a novel by George Orwell). in the “network of tomorrow” they will be marked with the help of ontologies. This will make information processing easier for software agents. We will be able to go beyond keyword searches.2.2 The Semantic WebThe Semantic Web is not a new resource on the Internet but rather an extension of the current Web, in which information is assigned a well-defined meaning, thus allowing computers and people to process it. We need a way for machines to identify and understand equivalent resources without programming this knowledge into application software [5]. The Semantic Web uses ontologies as a vital element to tag and represent knowledge for machines and humans to understand. 2.1 Ontology The term Ontology includes concepts, properties of concepts, relationships between concepts and constraints [5]. Ontologies are defined independently of actual data and reflect a common understanding of the semantics of the discourse domain. Ontology is an explicit specification of a conceptualization [3]. It is a domain-representative vocabulary; a definition of classes, relationships, functions, constraints, attributes, and other objects. In practice,......half of the document......the Ontology Specifications.Knowledge Acquisition, 5(2):199-220, 1993.[4] Arasu, A., Cho, J., Garcia-Molina, H., Andreas Paepcke, & Raghavan, S. (2008). Web Search. ACM, 8.[5] Semantic Web (CO7216) Retrieved 5 5, 2014 https://blackboard.le.ac.uk/bbcswebdav/pid-734640-dt-content-rid-2615229_2/courses/CO7216/CO7216-beamer-2013%281%29. pdf[6] Grimm, S., Hitzler, P., & Abecker, A. (2008). Knowledge representation and ontologies. Logic, ontologies and semantic languages ​​of the web.[7] Antoniou, G., & Harmelen, F. v. (2008). A manual on the semantic web. Massachusetts Institute of Technology.[8] W3C. (2014, 2). Retrieved 5 1, 2014, from W3C: http://www.w3.org/[9] Zarri, G. P. (2011). Semantic web and knowledge representation. IEEE Explore.[10] Hillmann, D. (2001). Using Dublin Core. Dublin Core. Retrieved 05/07/2014 from Dublin Core: (http://dublincore.org/documents)