Off-page optimization are strategies for search engine optimization that are done off the pages of a website to maximize its performance in the search engines for target keywords related to the page content. Examples of off-page optimization include linking, and placing keywords within link anchor text.
on-page optimization refers to factors that have an effect on your Web site or Web page listing in natural search results. These factors are controlled by you or by coding on your page. Examples of on-page optimization include actual HTML code, meta tags, keyword placement and keyword density.

SEO page optimization includes both on-page and off-page optimization. There's a big difference between the two and you should not rely on one at the expense of the other.

Hi
On page optimization is relate to the title ,description ,website content and keyword . off optimization is totally a link building service.