Off page optimization is that part of the search engine optimization which plays the most important role in the search engine optimization of the any webpage or website. The off page optimization is that part of the SEO which is neither performed upon the web site but, is done by the search engine optimizer. This refers to that part of measure which is performed outside of the website in order to improve the search engine ranking and position of website upon the search engines. One such strategy, to improve search engine ranking, is the backlinks, i.e. incoming links, blog posting, and forums posting etc.
But, off page optimization is done by the content writer who writes the so high quality material that any other website or the webpage may refer the same content upon their own and may give you the back link. This back link makes the difference when the ranking of any website is measured at search engines by analyzing the page and domain authority. So, the main responsibility of the off page optimization depends upon the content writer who writes the very high quality content for the websites and web pages