Backlink: what makes one valuable or worthless for your SEO

What exactly is a backlink?

A backlink is a link on an external domain that points to a page on your website. It is also called an inbound link, as opposed to an internal link, which connects two pages within the same domain. Every backlink works as a reference: the linking page tells both the user and Google that relevant content exists on your site.

In code, a backlink is an <a> tag in the HTML of the linking page. The browser renders it as underlined or differently colored text, the anchor text, which usually describes what the destination page is about. Google's crawlers follow these links and use them as one of many signals to work out how relevant a page is within its topic.

The logic behind backlinks goes back to Google's original PageRank algorithm, published in 1998: each link passes on a fraction of the linking page's authority. The more quality links a page receives, the more weight it carries in the algorithm. That principle still holds, though the current algorithm weighs many more signals, and simply accumulating links without judgment no longer works.

That is why backlinks remain one of the most cited off-page ranking factors in SEO, alongside unlinked brand mentions, the topical relevance of the linking domain, and the behavior of users who arrive through that link.

You can see the backlinks pointing to your own domain in the Links report inside Google Search Console, though that list rarely matches third-party tools like Ahrefs or Semrush exactly, since each one crawls the web with its own crawler and on a different schedule. For a full picture, it is worth cross-checking several sources instead of relying on just one.

What separates a valuable backlink from a worthless one?

The question that actually matters is not how many backlinks a page has, but which of those links contribute anything. A backlink from an unrelated site, placed in the footer, is not the same as a link inside a relevant article about your industry, even though both count equally as "one backlink" in any tracking tool.

Four criteria decide whether a link contributes or is just noise.

Topical relevance of the linking page. A link from a plumbing blog to your plumbing supply store carries more weight than the same link from a generic business directory with no connection to your field. Google reads the topical context of the linking page, beyond the mere existence of the link.

Position of the link within the content. A link placed inside the body of an article, surrounded by text that justifies it, signals more trust than a link in the sidebar, the footer, or a generic "recommended links" block. Position shows whether the link grew editorially or was bolted on afterward.

Real traffic on the linking page. A page with genuine visitors and active users usually belongs to a domain with real authority. A page with no traffic contributes little real value, even if some SEO tool assigns it a high authority score.

Naturalness of the anchor text. A backlink with varied anchor text that fits the context, such as "check out this guide" or the brand name, reads as organic. A repeated pattern of exact-match commercial anchor text across dozens of domains is the typical fingerprint of an artificial link scheme, and Google detects that pattern reliably.

No single criterion works on its own. A well-placed link on an irrelevant domain still contributes little, and a relevant domain with the link buried in the footer does not make up for it either. In practice, one backlink from an industry publication with real traffic and a genuine editorial mention can outweigh thirty links from generic directories or forum comments.

The link attribute matters too. A dofollow link passes the signal directly; a link marked nofollow, sponsored, or ugc does not pass the same ranking credit, though Google has clarified that it can still use such links as an additional signal within a page's overall link profile. Official documentation recommends marking paid or advertising links as sponsored and links from user-generated content, such as comments or forum posts, as ugc.

The spread of linking domains matters too, alongside the raw link count. A hundred backlinks from ten different relevant domains usually outweigh a hundred backlinks from a single domain, however relevant that domain is, because Google reads source diversity as an additional signal that the content genuinely interests the wider industry, not just one partner.

Why the answer changed since the link spam updates

For years, backlink strategy relied heavily on volume: the more links pointed at a page, the better. That logic worked as long as Google's algorithms struggled to tell a genuine editorial link apart from a purchased one or one generated by an automated directory.

That phase is over, at least as a working strategy. Google confirmed the "December 2022 link spam update," a global rollout across all languages that ran from December 14, 2022 to January 12, 2023 (date checked at the primary source: status.search.google.com, accessed 08.08.2026). Its stated goal was to improve detection of link schemes built specifically to manipulate rankings, including bought links and mass link exchanges with no editorial relationship.

That update was not an isolated event; it was part of a series of changes Google has rolled out since 2021 to strengthen automated link spam detection (general background, not verified against an exact date in this piece). What is confirmed in Google's current documentation is the standard applied today: the active spam policy defines link spam as the practice of creating links to or from a site primarily to manipulate ranking, and it explicitly classifies buying or selling links, as well as excessive link exchanges, as violations of its guidelines (source checked, see Sources).

None of this means volume is irrelevant: a domain with many quality links still outperforms one with few. But volume no longer makes up for a lack of relevance. Ten irrelevant links do not equal one relevant one, and chasing the number instead of the context often ends in a manual action or a visibility drop after a spam update.

The practical consequence for anyone building links today is this: a backlink profile that grows fast through low-relevance links and generic footer placements no longer goes unnoticed. What sustains ranking now is a link that sits in a genuine editorial context, with topical relevance and verifiable traffic behind it.

For small and mid-sized sites, that is not bad news. A single, topically relevant backlink from a well-known publication in your field can now do more than a whole package of purchased links used to, because the evaluation weighs context more heavily than volume, and volume was never something smaller budgets could buy much of anyway.

Best practices for building quality backlinks

• Prioritize industry publications and relevant websites over generic directories: one link from a specialist blog with real traffic outweighs ten links from directories with no visitors.
• Ask for the link to sit inside the body of the article, not in the footer and not in a separate "recommended links" block.
• Check the linking page's approximate traffic before accepting or paying for a link, using Google Search Console if you have access to the property, or an external tool otherwise.
• Vary the anchor text: use your brand name, a descriptive phrase, or a bare URL instead of repeating the same commercial keyword every time.
• Earn links through content others want to cite on its own merit, such as original data, technical guides, or free tools, instead of asking for the link directly.
• Pair backlinks with solid internal linking: a backlink that lands on a page well connected internally spreads its authority more effectively across the rest of the site.
• Diversify your linking domains: spread the effort across several relevant sites instead of pulling most of your links from a single partner.

Common mistakes when chasing backlinks

• Buying "one hundred backlinks" packages on marketplaces: these are almost always links from networks of domains with no real traffic, exactly the pattern the 2022 link spam update started catching more precisely.
• Repeating the same commercial anchor text on every link earned, which creates an artificial pattern that is easy to flag.
• Accepting any link just because it raises the backlink count in an SEO tool, without checking the relevance of the linking domain.
• Ignoring broken or lost links: when a page that linked to you disappears or changes URL without a redirect, that backlink stops contributing, and it is worth reclaiming or replacing it.
• Confusing quantity with quality when reading a backlink report: a sudden jump in the total link count usually signals an incoming spam campaign, not a link-building win.
• Relying on a single third-party tool to measure your link profile: no tool crawls the entire web, so it is worth cross-checking at least one more source, such as Google Search Console.