Wikipedia (/ˌwɪkɪˈpiːdiə/ (listen) wik-ih-PEE-dee-ə or /ˌwɪki-/ (listen) wik-ee-) is a multilingual free online encyclopedia written and maintained by a community of volunteers through open collaboration and a wiki-based editing system. Individual contributors, also called editors, are known as Wikipedians. Wikipedia is the largest and most-read reference work in history. It is consistently one of the 15 most popular websites ranked by Alexa; as of 2022, Wikipedia was ranked the 10th most popular site. It is hosted by the Wikimedia Foundation, an American non-profit organization funded mainly through donations.