SEO is a strategy to optimize a website to rank highly in search engines and improve traffic. The higher a website ranks, the more likely users are to visit it when searching terms related to the site's content. Search engines rank sites based on the quality and number of incoming links from other websites. Doing SEO yourself can help a site get better rankings and a good return on investment through increased traffic. The SEO course covers on-page and off-page optimization techniques like keywords, links, meta tags, content, social media promotion, and link building to help rank a site higher.