The first edit to the internet encyclopedia Wikipedia was made.

The first edit in Wikipedia's database, to HomePage, was made on January 15, 2001, and states in its entirety "This is the new WikiPedia!" In December 2021, co-founder Jimmy Wales announced that he would sell a website containing a re-creation of an earlier edit that he said he made and then later deleted, which contained the text "Hello, World!", to the highest bidder as a non-fungible token (NFT).

Wikipedia is a free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki. Founded by Jimmy Wales and Larry Sanger in 2001, Wikipedia has been hosted since 2003 by the Wikimedia Foundation, an American nonprofit organization funded mainly by donations from readers. Wikipedia is the largest and most-read reference work in history.