These stores are based on the Resource Description Framework (RDF) methodology that was initially meant for describing IT resource metadata. Today, the application area of such databases is more generic, mostly for semantic and some other types of web applications.
In a RDF database, information is stored in the form of subject-predicate-object triples.
Examples of RDF stores are MarkLogic, Jena, Virtuoso, AllegroGraph, and Stardog.
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