About Wikidata is a secondary collaborative database that is curated by individuals to ultimately retrieve and store information. As of now, the database contains nearly 100 million data items, all of which can be edited by Wikidata users, at any given time. Wikidata Items For instance, below is an image of the item Philadelphia Musuem of Art. As the image shows, the museum is classified as an instance of another item, the art museum.