Link Popularity is an important Off-page SEO strategy. It refers to the total number of links that point to a website. These links are of two types; internal and external. Internal links are the links from your own webpages and external links are from other webpages or websites.
The high link popularity shows that more people are connected to your site and it contains useful content and information. So, it is one of the important factors for the search engines to rank websites in search engine result pages, i.e. if there are two websites with same level of search engine optimization then the site with higher link popularity will be ranked higher than the other by the search engine.