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/20110106224442/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/seo
SEO or Search Engine Optimisation is the term used to improve a Websites ranking on a search engine. It is usually in the form of the websites text content and uses keywords to achieve high rankings.