Backlink

A backlink is any link that originates on a domain you don't control and points to a page on your site. Search engines treat backlinks as votes of confidence—the more authoritative and relevant the linking site, the more weight that vote carries. Google's PageRank algorithm was built on this principle, and backlinks remain one of the strongest ranking signals today.

In practice, SEOs spend significant effort acquiring backlinks through outreach, content creation, and relationship-building because a site's backlink profile directly influences its ability to rank for competitive queries. A backlink from a high-authority, topically-related site can drive more ranking improvement than dozens of links from low-quality sources. Conversely, spammy or manipulative linking can trigger manual actions or algorithmic penalties.

Backlink quality depends on the authority of the linking domain, the relevance of the linking page to your content, the anchor text used, and whether the link is editorial (earned naturally) or placed (paid or requested). Monitoring your backlink profile—new links, lost links, linking domains, anchor text distribution—is standard SEO maintenance.