Backlinks are links on other sites that point to your site. Search engines analyze the count and quality of inbound links that lead to your site. Your ranking is directly related to the quality of your backlinks. The more (quality) backlinks you have, the more you can get ranked by search engines. Google and other search engines analyze every best backlink and take good links as a reference. As a result, the higher the number of backlinks, the more reliable and useful search engines will consider your web site. And, ultimately, the better your ranking.