Backlink
A backlink is a link from another website to yours. Search engines treat relevant backlinks from trusted sites as a sign your page is worth ranking.
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What Backlink means
Backlinks (also inbound or incoming links) were the basis of Google's original PageRank algorithm and remain an important ranking signal. Their value depends on the linking site's relevance and trust, where the link sits on the page, and its attributes: links marked nofollow, sponsored or ugc are hints not to pass ranking value.