Meanwhile, Off-Page SEO is all about taking action for your website, but outside of it. This is done by backlinking (linking your website on another website), promoting your website on other websites, ads from social media and etc. Google also takes into consideration many off-page factors (mostly backlinks) when deciding where to rank your page.
Backlinks are the most important because Google search is built on something called PageRank: an algorithm that looks at the quantity and quality of backlinks pointing to a web page. Some SEO professionals see PageRank as an outdated concept, but Google confirmed that it’s still a ranking factor only last year.