Wikidata
More info
- Released
- Owner
- Wikimedia Foundation
- Type
- Knowledge graph
- License
- CC0
- Website
- wikidata.org
Wikimedia's free knowledge graph — Wikipedia's facts as structured, machine-readable data.
Every thing has a Q-number (Douglas Adams is Q42) and every property a P-number. Statements are triples carrying sources and qualifiers, so "population" can hold both a year and a measurement method. The query language is SPARQL.
Started in 2012 and has passed 100 million items. It feeds Wikipedia infoboxes, sits behind voice assistants' factual answers, and is widely used as ground truth when training and evaluating language models.