The Internet Archive is an "online library" containing various public domain and Creative Commons downloads with culture being the primary focus. Early 78 RPM records, Grateful Dead concerts, and the Wayback Machine are notable features of the site.
The Internet Archive operates the Wayback Machine, a caching service. Named after a recurring segment of the Rocky and Bullwinkle cartoon, the Wayback Machine stores copies of Internet sites indexed by date. A Web site owner may opt-out of this caching through use of a "robots.txt" file or by request.
The Wayback Machine has been used in the past to expose the past activity of politicians, including issues relating to 9/11 conspiracy theories, Barack Obama's involvement with a socialist political party, and the Barack Obama birthplace controversy