A triplestore is a purpose-built database for the storage and retrieval of Resource Description Framework (RDF) metadata. 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 fun" or "Bob can swim". Some triplestores can store billions of triples. The performance of a particular triplestore can be measured with the Lehigh University Benchmark (LUBM).