SEO is generally divided into three main types. On-page SEO refers to everything you optimize directly on your website — like content, titles, headings, and keyword usage. Off-page SEO involves actions taken outside your website to build authority, such as getting backlinks from other trusted sites, social media mentions, and online reputation. Technical SEO focuses on the backend health of your website — things like site speed, mobile responsiveness, secure HTTPS connections, and how easily Google can crawl and index your pages. A strong SEO strategy requires all three types working together; focusing on just one will limit your results.