On-site SEO (also known as on-page SEO) is the practice of optimizing elements on a website (as opposed to links elsewhere on the Internet and other external signals collectively known as "off-site SEO") in order to rank higher and earn more relevant traffic from search engines. On-site SEO refers to optimizing both the content and HTML source code of a page. On-Page Search Engine Optimization Page Titles. Your page titles are one of the most important SEO factors on your site. ... Meta Descriptions. Many people forget to include meta descriptions for their pages. ... Meta Tags. ... URL Structure. ... Body Tags (H1, H2, H3, H4, etc.) ... Keyword Density. ... Image SEO. ... Internal Linking.