Wikipedia is a collaboratively edited, multilingual, free Internet encyclopedia that is supported by the non-profit Wikimedia Foundation. Anyone who can access the site can edit almost any of its articles.
As with any publicly edited and created content website you must use caution and verify anything you see as suspicious or untrue.
This is one of many Wikipedia domains. While it is a good source of information the reliability is not always good. For any serious work double check your facts.