Original sentence: A domain Ontology (or domain-specific ontology) models a specific domain, or part of the world.An ontology language is a formal language used to encode the ontology.In both computer science and information science, an ontology is a data model that represents a set of concepts within a domain and the relationships between those concepts.It contains a core glossary in whose terms objects in a set of domains can be described.It is playing an important role in an increasing number and range of applications, and is the focus of research into tools, reasoning techniques, formal foundations and language extensions.It is used to reason about the objects within that domain.It was developed to augment the facilities for expressing semantics (meaning) provided by XML, RDF (Resource Description Framework) and RDF-S.OWL currently has three sublanguages (sometimes also referred to as 'species'): OWL Lite, OWL DL, and OWL Full.OWL is seen as a major technology for the future implementation of a Semantic Web.OWL was designed to provide a common way to process the semantic content of web information.OWL, KIF, CycL are different ontology languages.Ontologies are used in artificial intelligence, the semantic web, software engineering, biomedical informatics and information architecture as a form of knowledge representation about the world or some part of it.Ontology is defined as a formal and explicit specification of a shared conceptualization of a domain.There are a number of such languages for ontologies, both proprietary and standards-based:.Upper Ontology (or foundation ontology) is a model of the common objects that are generally applicable across a wide range of domain ontologies.most ontologies describe individuals (instances), classes (concepts), attributes, and relations