The document provides an overview of search engine optimization (SEO). It defines what a search engine is and what SEO is. SEO is the process of improving a website's visibility in search engines through various techniques like keyword research, on-page optimization of titles, descriptions and content, and off-page factors like inbound links. Regularly updating content and using analytics helps maintain and improve search rankings over time. Key aspects discussed include keywords, page titles, meta descriptions, URLs, images and inbound/outbound links.