A backlink is a link from another website pointing to your website. Google treats backlinks as “votes of confidence” — when a trusted, authoritative site links to your content, it signals to Google that your page is credible and valuable, which helps improve your rankings. Not all backlinks are equal, though; a link from a well-established, relevant website carries far more weight than dozens of links from low-quality or unrelated sites. Building a strong backlink profile takes time and is considered one of the top three ranking factors in modern SEO, alongside content quality and technical health.