On-page optimization (OPO) concerns all changes to the structure of web pages or their content.
On-page optimization concerns all measures related to the change to the source codes. The goal of on-page optimization is search engine optimization( SEO) and thus the improvement of the ranking and a higher ranking in the search engine results pages( SERP). On-page optimization includes the structure of the website, the layout with all typographic features, the metatags, the web address, headings and the content. For on-page optimization, dubious methods such as hidden text are also used.