Triplestore
en.wikipedia.org/wiki/Triplestore
Article
Triplestore
Database for storage and retrieval of triples
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Much like a relational database, one stores information in a triplestore and retrieves it via a query language. Unlike a relational database, a triplestore is optimized for the storage and retrieval of many short statements called triples, in the form of subject-predicate-object, like "Bob is 35" or "Bob knows Fred".