A triple store is a database purpose-built to store and query RDF data as subject-predicate-object triples, forming the storage layer for semantic-web and knowledge-graph applications. It supports the SPARQL query language and often provides reasoning and inference over ontologies, enabling expressive graph traversal and entailment beyond what relational stores offer.
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- Triple stores index data in permutations such as SPO, POS, and OSP to make graph pattern matching efficient at scale. Many also implement RDFS/OWL reasoning so that implicit facts can be derived through entailment, which is central to ontology-driven knowledge systems.