WHAT IS On-Site optimization?

On-Site optimization or On page optimization means, Some related changes in website code to get higher rankings in search engines...its all about keyword selection and about optimizing the code inside your site, Its includes content, anchor text, pages, navigation, Meta tags updation, XML sitemap creation and everything else.
On page optimization is one of the process of search engine optimization (Buy Backlinks SEO) which makes your website more search engine friendly so that website can achieve higher rankings in search engines.