On-Page SEO is built into your website and how you communicate to Google what your site is all about. It is the act of upgrading individual site pages so as to rank higher and acquire progressively important traffic in web indexes. Both the HTML source code and the content of each page on the site plays a factor in on-page SEO. Any content that cannot be linked or is not accessible by “robots” that check the validity of your site does not help your on-page SEO. Pages that can’t be linked include password-protected pages, certain slideshows, and unsharable content.