A backlink is a link from one website to another. When a website links to your site, it’s like a vote of confidence, suggesting that your content is valuable. Search engines like Google use backlinks to determine the quality and relevance of your site, which can help improve your ranking in search results. Having more backlinks from reputable sites can boost your website's visibility and credibility. For example, if a popular blog about technology links to your article, it can drive traffic to your site and enhance your reputation in the online community.