The Wayback Machine is a digital archive of the World Wide Web and other information on the Internet created by the Internet Archive, a nonprofit organization, based in San Francisco, California, United States. The Internet Archive launched the Wayback Machine in October 2001. It was set up by Brewster Kahle and Bruce Gilliat, and is maintained with content from Alexa Internet. The service enables users to see archived versions of web pages across time, which the archive calls a "three dimensional index".
Since 1996, the Wayback Machine has been archiving cached pages of websites onto its large cluster of Linux nodes. It revisits sites every few weeks or months and archives a new version. Sites can also be captured on the fly by visitors who enter the site's URL into a search box. The intent is to capture and archive content that otherwise would be lost whenever a site is changed or closed down. The overall vision of the machine's creators is to archive the entire Internet.
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