Off-Page Optimization is the process SEO's use in order to make back links and to rank well in search engines.
There are many ways to do off page optimization like article submission, blog commenting, making blogs, creating a link juice, forum posting, press release submissions, giving answers in sites such as yahoo answer with a link etc.
The benefit is if you get lots of links from high authority websites you will be able to rank better on Search Engines.
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