Wikidata is one of the projects run by the Wikimedia Foundation which is a non-profit and charitable organisation.

It is a free and open knowledge base that turns information into structured and machine-readable data.

Wikidata is:

• a repository of the world's knowledge 
• a database that anyone can read and edit
• multilingual 
• free and open source software
• all data is CC-0 licenced meaning it can be used by anyone