This document provides an introduction to search engine optimization (SEO). It explains that SEO involves optimizing a website to generate free traffic from search engines like Google by ranking for relevant keywords and becoming an authority on certain topics. It discusses the importance of targeting key internal pages beyond just the homepage. SEO consists of on-site technical elements like meta tags and URLs, on-site content creation through producing high-quality, keyword-rich content, and off-site elements like obtaining inbound links and citations from other websites. Examples are given of how SEO and paid search marketing like AdWords are balanced for different industry keywords.