The ranking of websites on search engines also depends on the popularity, relevance, quality and usefulness of the feedback. Websites that have original, quality, necessary content can easily gain the user's trust from other websites, blogs, comments, wikis, forums, social networks and to get a backlink.
A backlink is a link between two different external domains. The quality of the backlink depends on the page that links us as anchor text. Quality backlinks are obtained from popular sites that have strong domain authority.
Pages that send us backlinks indicate and corroborate search engine authority that we have value. Not all backlinks have the same value. The value of backlinks must satisfy many attributes.
Traffic and search engine rankings increase with more quality backlinks.
Organic backlinks are best valued by search engines.
More about backlinks at:ahrefs.com,moz.com,semrush.com etc.