This document provides an overview of search engine optimization (SEO) including how search engines work, key SEO concepts like page rank and on-page/off-page optimization, and tools used for SEO. It defines SEO as affecting website visibility in organic search results and discusses strategies like optimizing content, links, and metadata. On-page optimization applies to website coding while off-page optimization uses external links and citations. Both approaches require ongoing effort over months to achieve results from search engines. The document also lists popular search engines and free/paid SEO tools.