"The fundamental principles of Wikipedia may be summarized in five "pillars":
Wikipedia is a free online collaborative encyclopedia. Launched in 2001, it has grown in popularity and become one of the most visited websites on the internet, with millions of visitors every month.
Wikipedia is hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other projects:
A vast amount of online help is available to help you understand what Wikipedia is, how it operates, and how you can contribute to the resources".