Backlinks. The original ranking signal, still doing most of the heavy lifting.

What a backlink actually is

A backlink is any hyperlink on someone else's website that points at your website. The most basic example: a journalist writes an article about Perth roofing and includes a clickable link to a roofer's site. That link is a backlink for the roofer. In SEO terms the backlink is a third-party vote of confidence. Someone outside your business has decided your page is worth referencing, and Google's algorithm reads that signal as part of how it ranks your site.

The original idea goes back to 1998, when Sergey Brin and Larry Page wrote the PageRank paper that became Google. The argument was simple: if academic papers are evaluated by how often other papers cite them, the open web could be evaluated the same way. A page with many high-quality citations is probably more important than one with none. Twenty-eight years later, the underlying logic is still in the algorithm, alongside a long list of newer signals.

In practice the backlink consists of three things Google reads:

1. The source page. Where the link lives. Its topic, its credibility, its own backlink profile, its position in the broader web graph.
2. The anchor text. The clickable text inside the link tag. This tells Google what the source thinks the destination page is about.
3. The link attributes. Whether the link has a rel attribute like nofollow, sponsored or ugc that modifies how Google weighs it.

One link is rarely decisive. A pattern of links across many credible sources is what shifts rankings. We will get to anchor text in detail in the anchor text profile chapter and the rel attributes in the link attributes chapter.

Why backlinks still matter in 2026

Every two years someone declares that links are dead. They are not. Google's senior search team has said the opposite, repeatedly, since the 2024 spam updates. Links remain a top-three ranking signal alongside content quality and the broader cluster of E-E-A-T signals. The 2025 Search Central documentation still lists external links as a core trust input.

Three things have changed that you should understand before reading any older article on this topic:

1. The quality bar moved up

SpamBrain, Google's machine-learning spam-detection system, has had four major updates since 2022 focused on link manipulation. Most of what those updates do is not penalise sites. They neutralise the offending links. Links from low-quality directories, mass guest post networks, comment spam, and obviously paid placements increasingly contribute nothing to ranking. The site is not punished, the spend is just wasted.

2. Topical relevance got more important

A link from a small site in your category is now worth meaningfully more than a link from a large generic site. The shift toward topical authority means Google increasingly weighs whether a linking site is recognised as an authority in the destination's topic. For Perth businesses, that often means a small regional industry site beats a giant unrelated one.

3. AI Overviews changed the click economy

AI Overviews at the top of many SERPs are now influenced by both content quality and brand entity strength, the second of which leans heavily on the backlink profile. Being cited inside an AI Overview is partly a function of being a recognisable entity Google trusts to summarise. Backlinks feed into that recognition. For the wider picture, the AI Search pillar goes deeper.

The four types of backlinks

Not all backlinks are the same. The four categories below cover almost every link your site will ever earn, and the value gap between them is large.

Type 1: Editorial

A journalist, editor, blogger or content creator decides to reference your site, of their own volition. No payment, no trade, no quid pro quo. This is the gold standard. Every other type of link is judged against this benchmark by Google's algorithm. A single editorial link from a credible publication outweighs dozens of links from any other category.

Type 2: Directory and listing

Your business listed on a directory, business register, industry association, or local chamber of commerce. The link is given as part of a structured listing rather than an editorial mention. Lower individual weight than editorial, but cumulatively important because directories also feed citation consistency and local trust. The Australian citations chapter covers the directory layer in depth.

Type 3: Self-published

Profile links, comment links, forum signatures, user bios, syndicated content with author bylines. Usually carry a nofollow or ugc attribute. Low individual weight. Useful for a natural-looking link profile in small numbers. A profile heavy with self-published links signals manipulation.

Type 4: Paid or traded

Sponsored placements, paid guest posts, link exchanges, PBN links, ad-network links. Google's policy requires these to be marked with rel="sponsored" or rel="nofollow" so they do not pass ranking signals. When they are not marked and Google detects the pattern, the links are neutralised by SpamBrain and the site can face a manual action. This is the category we refuse to touch for clients.

What makes a backlink count

Four factors decide how much a given link contributes to your rankings. The bar is higher than it used to be.

Topical relevance

Is the linking page genuinely about a related topic? A link from a roofing trade magazine to a roofer is on-topic. A link from a general news site that wrote about Perth roofing because there was a storm is still on-topic, though more loosely. A link from a generic "best of the web" list page is off-topic and worth almost nothing.

Source credibility

Does the linking site have a real audience, real content, a recognisable brand, and a healthy own-link profile? Or is it a sparse domain with no traffic that exists to sell links? Google's algorithm uses dozens of signals to make that judgement, and SpamBrain catches most of the latter category.

Editorial intent

Was the link given freely as part of legitimate content? Or does the pattern of links from the source look manufactured (lots of links to the same target, suspiciously commercial anchor text, no other editorial signals)? Editorial intent is the single biggest weighting factor after relevance.

Placement on the page

A link inside the main body content, in a prose paragraph, carries more weight than a link in a sidebar widget, a footer, or a list of "partners". Google's algorithm has been able to read on-page link position for over a decade, and the gap between an in-content link and a sitewide footer link is large.

Multiply those four factors together and you get a quick mental model. The same link can be worth a dozen of itself in a different context. This is why we tell Perth clients that the goal is not to chase a number. It is to earn the right kind of link, repeatedly.

How to read your backlink profile

You can do most of this for free, in Search Console, in 20 minutes. The steps:

1. Open the Links report. In Search Console, sidebar then Links. Two sub-reports: External links and Top linking sites.
2. Read top linked pages. Which pages on your site attract the most links? Often it is the homepage and a couple of content pages. If commercial service pages have zero links, that is a finding.
3. Read top linking sites. Sort by site. Look at the top thirty. Click through to a sample of them. Are they real sites? Do they make sense as link sources for your business?
4. Read top anchor text. Scroll to the anchor text report. What words and phrases are people using to link to you? If the top anchor is the brand name and a few descriptive phrases, healthy. If the top anchors are exact-match commercial keywords with suspiciously high volume, unhealthy.
5. Spot the patterns. A small handful of dominant referring domains is normal. A long tail of one-link domains is normal. A cluster of new low-quality domains all linking the same week is not normal and warrants investigation.

Most Perth businesses have never opened this report. The first time we look at it together with a client, we usually find both good news (real editorial coverage they did not know about) and risk indicators (a directory submission service used a previous owner who left behind low-quality links). The audit is always worth the time. The disavow chapter covers what to do with the risk findings.

Common mistakes

Tools and checklists

The free tools you need to understand backlinks properly:

1. Google Search Console. Free, accurate, the source of truth for the links Google has actually indexed.
2. Ahrefs Free. A daily allowance of backlink lookups, with anchor text and referring domain data. Useful for a quick competitor comparison.
3. Semrush Free. Equivalent free tier with slightly different methodology. Worth cross-checking when the two disagree.
4. Open Site Explorer (Moz). Limited free queries. Useful when you want a third opinion.
5. A spreadsheet. One row per significant link. Source URL, anchor text, date, page linked to, follow type. Updated quarterly.

For a quick read on your own site's link profile, anchor distribution and any SpamBrain risk patterns, our free SEO audit tool bundles the backlink scan with the broader technical and on-page check. For the wider audit process, see the website audits service page.

Perth and WA context

Three patterns we see repeatedly in Perth backlink audits:

Trades businesses are sitting on uncounted local links. Master Builders WA, MBA, Housing Industry Australia, the various trade certification bodies, and the regional council business directories all list members with editorial links. Most trades businesses we audit are members but have never claimed or updated the listing. Twenty minutes of work each unlocks a relevant Australian link. See the trades SEO guide for the trade-specific playbook and SEO Fremantle for the Fremantle service-area example.

Mining services firms have under-used industry publications. Australian Mining, Mining Weekly Australia, the various WA-specific resource publications, and the chamber of minerals all run case studies, supplier directories, and expert commentary slots. A single expert commentary piece in Australian Mining is worth more than a quarter of generic outreach. The mining SEO guide covers the publication list, and SEO Karratha shows the regional pattern.

Healthcare and legal firms underestimate professional association links. RACGP, AMA WA, the Law Society of WA, the various specialty colleges and bar associations all maintain member directories with editorial links. The links count, the citation consistency matters, and the audience clicks. See the healthcare SEO and legal SEO guides for the category playbooks.

Related guides

• Link building tactics that actually work. Once you understand what a backlink is, this is how to earn more of the good ones.
• Anchor text profile for safe link building. The anchor text patterns SpamBrain watches and how to keep yours healthy.
• nofollow / sponsored / ugc explained. The four link attributes and how Google reads each.
• How to disavow toxic backlinks. When to use the disavow file on a profile you have just audited.
• DR vs DA (and why neither matter). Why the third-party authority scores should not steer your link strategy.
• Internal linking strategy. The other half of link work. Inside your own site.
• What is SEO? The broader picture. Backlinks are one layer of three.