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Started in January 2001, Wikipedia is currently the world's fastest-growing, most current, and largest encyclopedia, with 2.5 million articles under active development in over 120 languages. It is created entirely by volunteers who contribute, update, and revise articles in a collaborative process. The English-language edition contains 10 million internal links, and incorporates 25,000 edits and 1,500 new articles each day. Wikipedia's content is written for a general audience, and is continually being revised for clarity, readability, and accuracy. Original text, images and sounds contributed to Wikipedia are licensed under the GNU Free Documentation Licence (GFDL), which lets users copy and modify each other's work based on a principle known as "copyleft." The entire database is freely downloadable. ... (expand) (contract)