"In short, editing your page and content so the search engine can find your web page"
Web page optimisation, often a follow on process of SEO keyword research, also known as on-page optimisation, is the process of coding / preparing pages of your website to adhere to the guidelines of the search engine you wish to target.
'On page' simply refers to the text and content of your web pages. In short, editing your page and content so the search engine can find your web page when a searcher is searching for your websites particular topic.
On Page Search Engine Optimisation has been around for the longest, since the beginning of search engines. Search engines used simpler, less sophisticated technology a few years ago and the world wide web was a lot smaller.
At the time, 'on page' SEO worked years ago, and it was basically an easy comparison. As the world wide web grew larger and larger it became more difficult for search engines to differentiate between your site and other sites. As a result, off page optimisation (link building) has grown as the search engines have become more complexed.