The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106195322/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/ppc
PPC (Pay Per Click) is a method of Internet advertising where every time a person clicks on an advert (normally placed by the side of search results on a search engine) the advertiser gets charged.