Backlinks are hyperlinks from external websites that point to pages on your site. In the eyes of search engines like Google, each backlink functions as a vote of confidence, a signal that another website considers your content credible, relevant, and worth referencing. The more authoritative and topically relevant those linking sites are, the stronger the trust signal they send.
Research consistently shows that pages ranking in the top positions on Google have significantly more backlinks than those ranking lower. According to Ahrefs, 91% of all web pages receive zero organic traffic from Google, and the primary reason is a lack of backlinks. Building a strong, diverse, and high-quality link profile is not optional for competitive SEO; it is the foundation on which rankings are built.
"Links are one of the most important ways Google discovers new pages and determines how well a page should rank in search results. A site's link profile, the quantity, quality, and relevance of its inbound links, remains a core signal in Google's ranking systems."
Google Search Central, Links and Search Rankings