On-page SEO (sometimes called on-site SEO) is the process of optimizing parts of your webpages, so they rank higher on search engines and get more search engine traffic. This includes updating on-page content, title tags, internal links, and more.
Search engines like Google look at keywords and other on-page SEO cues to check whether a page matches a user’s search intent. And if the search engine decides the page will be useful to the user, it will display it higher in search results.