•Ontologies are usually expressed in a logic-based
 language, so that detailed, accurate,
 consistent, sound, and meaningful distinctions can be made among the classes, properties, and
 relations.
 •Ontologies figure prominently in the emerging Semantic
 Web as a way of representing the
 semantics of documents and enabling the semantics to be used by web applications and intelligent agents.
 
 •Ontologies can prove very useful for a community as a
 way of structuring and defining the meaning
 of the metadata terms that are currently
 being collected and standardized.
 •Using ontologies, tomorrow's applications can be
 "intelligent", in the sense that
 they can more accurately work at the human conceptual level.