On-page refers to both the content and the HTML source code of a page that can be optimized, as opposed to off-page SEO, which refers to links and other external signals. On-page SEO (also known as “On-Site SEO”) is the practice of optimizing web page content for search engines and users. Common on-page SEO practices include optimizing title tags, content, internal links, and URLs. On-page SEO (search engine optimization) refers to the process of optimizing your site's pages to improve ranking and user experience.
On-page SEO (also called in-place SEO) is the practice of optimizing web pages to rank better in search engines. It includes optimizations for visible content and HTML source code.