What a backlink is made of
Every backlink has four parts worth knowing: the source page it lives on, the destination URL it points to, the anchor text a reader clicks, and a link attribute — dofollow by default, or nofollow, sponsored, or ugc if the source site marked it that way. Each of these affects how much the link is worth and what it signals.
Why backlinks became a ranking signal
Google's original PageRank algorithm treated links between pages as votes of confidence, weighted by the authority of the page casting the vote. Decades on, links from relevant, reputable sources remain one of the signals search engines use to gauge a page's trust and relevance — alongside many others, not instead of them.
Not all backlinks carry equal weight
A link from a well-known, topically relevant site with real readers generally counts for more than the same link from an unrelated or low-quality site — and a large batch of low-quality links doesn't add up to one good one. Relevance, the linking page's own standing, and whether the link was editorially earned versus paid or exchanged all factor into how much it actually helps.
- Source page and destination URL — where the link lives and where it points
- Anchor text — the clickable words a reader sees
- Link attribute — dofollow, nofollow, sponsored, or ugc