Wikidata is an open-source, collaborative, knowledge base that stores structured data from many different sources, such as Wikipedia, to provide access to facts about the world. It is managed by the Wikimedia Foundation and is used by Wikimedia projects such as Wikipedia, Wikivoyage, and Wikisource, as well as by many other websites and applications. Wikidata allows users to store, edit, and query structured data in a way that is easier to understand and visualize than other databases. It includes millions of items in over 200 languages, including people, places, organizations, and events. It also includes millions of links to other websites, such as images, videos, and publications. The data is organized into a graph-like structure, which enables users to easily explore connections between different concepts and objects. Wikidata is free and open to the public, and anyone can contribute to it. It is designed to facilitate collaboration between users, and it is regularly updated with new information. The data is also available for download for use in other applications and projects.
Discontinued According to https://developers.google.com/freebase/, the API has been closed, but data dumps are still available.