Backlinking and “linking” are often used interchangeably to describe this process and it is essentially the term given to acquiring outside links from third-party websites in a way that refers back to your site as a trusted and credible source of information.
This in turn will signal to Google and other search engines that the content on your website is credible, accurate, and worth recommending to
their users. That is the basic theory anyway. Most people, however, will be completely unaware of exactly how a link from one site to yours can benefit
your rankings.
Essentially search engines use these links not just as a way to test individual sites for relevancy and authority to display accurate information to their users, but it also helps them to categorize and discover new web pages and establish what rank to give these sites in the search results for a given keyword. Essentially, linking helps search engines capture as much relevant data when a term is searched and in turn shows them what priority to give that site.
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