This document provides an overview of search engine optimization (SEO). It discusses what SEO is, why it is important to optimize websites for search engines. Key factors that affect search engine rankings are covered, including on-page elements like titles, meta descriptions and keywords; and off-page elements like backlinks, social sharing and authority sites. Common SEO myths are debunked. Best practices for SEO are outlined, such as optimizing titles and content, building high-quality links, using keyword research tools, and submitting sitemaps to search engines.