What Are Backlinks in SEO? How to Earn Good Ones (2026)

A backlink is a link from another website to yours, and search engines read it as a vote of confidence. After eleven years doing SEO, here’s the honest 2026 version: backlinks still matter, but they matter less than they used to — Google has quietly said so itself — and most “link building” advice is either spam or a waste of time. Here’s what backlinks are, how much weight they actually carry now, and how to earn good ones without buying into a scheme that gets you penalised.

What a backlink actually is

When another site links to a page of yours, that’s a backlink (also called an inbound or incoming link). Search engines read it as a signal: if credible sites point to you, you’re probably worth showing.

Backlink vs internal link: a backlink comes from a different domain; an internal link is one page of yours pointing to another page of yours. Internal links help Google understand your site’s structure and spread authority around it, but they aren’t votes from anyone else. Both matter — they just do different jobs.

Referring domains vs total backlinks is the distinction beginners miss most. Ten links from ten different websites are worth far more than ten links from one website. When you look at any backlink report, referring domains is the number that tells the real story.

Are backlinks still important in 2026?

Yes — but genuinely less than the SEO industry claims, and I’d rather tell you that than sell you a link-building package.

The evidence that they’ve been downgraded comes from Google itself:

• Gary Illyes (2023): people “overestimate the importance of links,” and he didn’t agree links were even in the top three ranking factors.
• Illyes again (2024): “We need very few links to rank pages… Over the years, we’ve made links less important.” He described a site ranking #1 that Google had discovered through its sitemap alone.
• March 2024: Google quietly edited its spam documentation to remove the word “important” where it described links as a ranking factor.

The evidence they still matter is correlational, and worth reading with that caveat firmly in mind:

• Backlinko’s analysis of 11.8M results found #1 results had roughly 3.8× more backlinks than positions 2–10, with referring domains the strongest correlation they measured (~0.38). That’s correlation, not causation — authoritative sites naturally attract links and rank well, and neither necessarily causes the other.
• Ahrefs found around 94% of all content earns zero external links, and pages with at least one backlink get substantially more organic traffic than pages with none.

The honest synthesis: links remain a real trust signal, and they matter most in competitive commercial niches. But they’re no longer the primary lever, you need far fewer than link sellers imply, and excellent content on a technically sound site can rank without a big link profile. Spend accordingly.

Do backlinks matter for AI search?

This is the newest part of the question, and it’s where the answer diverges from classic SEO.

AI answer engines don’t “rank” pages the way Google does — they assemble answers from sources they trust. The evidence so far suggests that what drives AI citations is how often and how recently you’re mentioned across the web, and the authority of the platforms mentioning you — with Reddit and YouTube carrying unusual weight. Notably, in analyses of what correlates with AI citation, brand mentions have outperformed backlinks, and an unlinked mention can count.

Practically: a mention of your brand in a relevant discussion may do more for AI visibility than a dofollow link from a mediocre site. That’s a genuine strategic shift, and I go deeper in how to get cited by ChatGPT and why AI engines cite Reddit.

But not all votes are equal.

Do all backlinks carry the same weight?

No — and this is where beginners go wrong. What separates a valuable link from a worthless one:

• Authority of the linking site. A link from a respected, established site is worth more than a hundred links from thin, spammy ones.
• Relevance. A link from a site in your topic carries far more weight than one from an unrelated directory.
• Editorial placement. A link placed in real content because it’s genuinely useful beats a footer or sidebar link every time.
• Anchor text. The clickable words give context. Natural, varied anchors are healthy; a profile dominated by exact-match commercial anchors (“buy cheap widgets”) is one of the loudest manipulation signals there is.
• Would a human actually click it? Google has increasingly framed link value this way, and it’s a good instinct — a link nobody would ever click probably isn’t worth much.

One clean, relevant, editorial link can outperform a thousand cheap ones. Quality is the entire game.

Link attributes, correctly explained

Most articles get this wrong, so here’s the accurate 2026 version:

• rel="nofollow" — the generic “don’t associate us with this” attribute.
• rel="sponsored" — paid or compensated placements (ads, affiliate links, sponsored posts).
• rel="ugc" — user-generated content: comments, forum posts, anything you don’t editorially control.

Two corrections worth internalising. First, these are hints, not directives — Google treats them as strong signals about how to process a link, not absolute commands. Second, and more importantly: paid links are not automatically against the rules. A paid link correctly marked sponsored or nofollow is entirely policy-compliant. The violation is a paid link that passes ranking credit without disclosure. That distinction is what separates legitimate sponsorship from a link scheme.

A natural profile contains a healthy mix of all of these. An all-dofollow profile looks manufactured.

How many backlinks do I need?

There’s no universal number, and anyone quoting one is guessing. The honest answer is however many the pages currently ranking have — which varies enormously by niche. Industry studies show low-competition verticals ranking with a few hundred referring domains while finance and insurance need thousands.

The practical method: search your target keyword, look at the referring-domain counts of the top three results, and treat that as your rough benchmark. And remember Illyes’ point — for genuinely low-competition, well-served queries, “very few” may be enough.

How to earn good backlinks (the honest way)

No link schemes — Google’s spam policies will catch bought and exchanged links, and the penalty isn’t worth it. These are the methods that still work in 2026:

1. Make something genuinely link-worthy. Original data, a real tool, a definitive guide. The single best “link building” is publishing something people want to cite. Most of my best links came to pages I never promoted.
2. Digital PR / expert sourcing. Answer journalist queries and you earn links from real publications. HARO changed hands (it’s now run by Featured.com), and strong successors like Qwoted and Source of Sources connect experts with reporters. Being a quotable expert is one of the highest-authority link sources going.
3. Guest posts — done right. A genuine article on a relevant, quality site is legitimate. Mass “guest post for a link” spam is not — Google treats that as a link scheme.
4. The broken-link technique. Find a dead link on a relevant page, offer your resource as the replacement. Helpful, and it works.
5. Original visuals and studies. Charts, graphics and data others reference — and cite you as the source.
6. Reclaim unlinked mentions. People mention your brand without linking; a polite email turns the mention into a link. A tool that monitors mentions makes this easy.
7. Study competitors’ links. See who links to your competitors and go after the same relevant sites. This is where a backlink tool earns its keep.

Analyze any site's backlinks in Semrush→

What Google actually counts as a link scheme

Google’s definition is precise: link spam is “creating links to or from a site primarily for the purpose of manipulating search rankings.” The named examples in its spam policies include buying or selling links that pass ranking credit, excessive reciprocal linking, automated link generation, advertorials with credit-passing links, low-quality directory links, site-wide footer and template links, forum signature links, and content created mainly to manipulate linking signals.

What to avoid, concretely: private blog networks (PBNs), bought dofollow links, mass directory submissions, and comment/forum signature spam. Google’s spam systems have been catching these at scale for years, and the downside — losing rankings you can’t easily win back — is far worse than the upside.

How to check your backlinks for free

You don’t need a paid tool to see your profile:

• Google Search Console → Links report. Free and authoritative-ish, though it’s sampled and aggregated rather than a complete real-time inventory. (Worth knowing: this report broke badly in May 2026, showing many sites near-zero links for weeks before a fix landed in June — if you see an alarming cliff, check whether it’s real before panicking.)
• Ahrefs Webmaster Tools — free for sites you verify, and shows up to 1,000 of your backlinks. The most generous free option by a distance.
• Ahrefs free Backlink Checker — top 100 backlinks for any domain, no login.
• Semrush’s free account and Seobility also give limited free backlink views.

Should you disavow bad links?

For almost everyone: no. This surprises people, so I’ll quote Google’s own documentation — it says that in most cases Google “can assess which links to trust without additional guidance, so most sites will not need to use this tool,” and warns that “if used incorrectly, this feature can potentially harm your site’s performance.”

Only disavow if you have an active manual action for unnatural links, or strong reason to believe one is coming from links you (or a previous agency) actually built. Do not disavow because rankings dropped, and do not disavow based on a “toxic link score” from a third-party tool — those scores are vendor inventions, not Google signals. There are documented cases of sites recovering after removing an over-aggressive disavow file.

Negative SEO is likewise far rarer than the tools selling protection against it suggest. Google is generally good at ignoring junk links pointed at you by someone else.

Tools make this dramatically faster

You can do backlink work manually, but it’s slow. A tool like Semrush shows your full link profile, monitors new and lost links, and — most usefully — reveals exactly who links to your competitors, handing you a ready-made outreach list. I walk through that competitor workflow in the Organic Research guide, and cover the whole platform in how to use Semrush.

The bottom line

Backlinks still matter — just less than the industry selling them wants you to believe, and less than they did five years ago. Quality beats quantity by a mile, referring domains matter more than raw link counts, and the durable strategy is to earn links by being worth linking to. Skip the shortcuts — bought dofollow links, private blog networks, mass directories. They’re a fast route to a penalty, not a ranking.

And note where the ground is shifting: as more discovery moves to AI answer engines, being mentioned is becoming as valuable as being linked. Build things people cite, be a quotable expert, and let both the links and the mentions follow. For the wider strategic picture, see the future of SEO.

See your backlink profile→

Frequently asked questions

What is a backlink in SEO?

A backlink is a link from another website to yours. Search engines treat it as a vote of confidence — the more high-quality, relevant sites that link to you, the more trustworthy your pages appear, which helps rankings.

Do backlinks still matter in 2026?

Yes, but less than they used to and less than the SEO industry claims. Google's Gary Illyes has said people overestimate links, that Google needs "very few links" to rank pages, and Google removed the word "important" from its documentation describing links as a ranking factor. Links remain a genuine trust signal, especially in competitive commercial niches, but strong content on a technically sound site can rank without a large link profile.

What's the difference between dofollow, nofollow, sponsored and ugc links?

Dofollow is the default and passes ranking credit. Nofollow is a generic "do not associate us with this" attribute, sponsored marks paid or compensated placements, and ugc marks user-generated content like comments and forum posts. Importantly, Google treats these as hints rather than absolute directives, and a natural profile contains a mix of all of them.

Are paid backlinks against Google's rules?

Only when they pass ranking credit. A paid or sponsored link correctly marked with rel="sponsored" or rel="nofollow" is fully compliant with Google's policies. The violation is buying or selling links that pass ranking signals without disclosure — that is what Google classifies as a link scheme.

What is the difference between a backlink and a referring domain?

A backlink is a single link; a referring domain is a unique website linking to you. Ten backlinks from ten different sites are worth far more than ten backlinks from one site, which is why referring domains is the more meaningful number in any backlink report.

How many backlinks do I need to rank?

There is no universal number — it depends entirely on your niche and the competition. The practical method is to search your target keyword and check the referring-domain counts of the top three results, then treat that as your benchmark. Low-competition queries may need very few links; finance and insurance terms can need thousands.

Should I disavow toxic backlinks?

Almost certainly not. Google's own documentation says most sites will not need the disavow tool because it can assess which links to trust on its own, and warns that incorrect use can harm your performance. Only disavow if you have an active manual action for unnatural links, or links you genuinely built. Never disavow based on a third-party "toxic score" — those are vendor metrics, not Google signals.

How do I check my backlinks for free?

Google Search Console's Links report is free and shows your profile, though it is sampled rather than complete. Ahrefs Webmaster Tools is the most generous free option, showing up to 1,000 backlinks for sites you verify, and the Ahrefs free Backlink Checker shows the top 100 backlinks for any domain without a login.

How do I get backlinks without buying them?

Earn them: publish genuinely link-worthy content (original data, tools, definitive guides), answer journalist queries via Featured.com, Qwoted or Source of Sources, write real guest posts on relevant sites, use the broken-link technique, and reclaim unlinked brand mentions. Buying links that pass ranking credit violates Google's policies and risks a penalty.

Do backlinks help you get cited by AI like ChatGPT?

Indirectly. AI answer engines appear to weigh how often and how recently your brand is mentioned across the web, and the authority of the platforms mentioning you, more heavily than raw backlinks. An unlinked mention on a high-trust source such as Reddit or YouTube can be more valuable for AI visibility than a dofollow link from a mediocre site.