Triplestores are a form of database used to store semantic web data.. RDF is encoded as subject–predicate–object triples and the triplestore stores and indexes these triples in order to make them easy to query and process. Often SPARQL is used to query a triplestore. The quadstore is an extension of the triplestore to store multiple graphs, that is collections of triples with a common origin or use.
Used in Chap. 17: pages 272, 273, 286