What is on page SEO?
The front-end element like content and the backend element like HTML source code of any web page are needed to be optimized. This is famously called on-page SEO which is the opposite of off-page SEO that refers to redirection and other links optimization.
To make the ranking of web pages higher in an efficient way, on-page SEO is a very good practice. Besides, more traffic can be regained by on-page SEO in search engines.