A backlink is a link on another website that points to a page on your website. When an industry magazine cites your research, a supplier lists you as a partner or a blogger recommends your guide, you have earned a backlink. Search engines read these links as evidence that other people found your content worth referencing.
In my SEO work, backlinks are still the topic where business owners lose the most money. Some pay for thousands of links that Google quietly ignores. Others panic over a few spammy domains in Search Console and disavow links that were helping them. This guide explains how Google really uses links according to its own documentation, which links carry value, which ones put you at risk and how to audit your link profile without guesswork.
What is a backlink?
A backlink, also called an inbound or incoming link, is a hyperlink on one website that leads to another. Wikipedia compares backlinks to citations in academic literature: a page linked from many trustworthy, relevant pages is probably useful, just like a paper cited by many respected papers.
From an SEO perspective, a backlink does three jobs:
- Discovery. Google follows links to find new pages, so a link from a frequently crawled page helps a new URL get found faster.
- Trust. A link works as a recommendation. Links from respected sources suggest your page deserves attention.
- Context. The clickable text of the link and the words around it tell Google what the target page is about.
The third point is older than most people think. In the original 1998 paper The Anatomy of a Large-Scale Hypertextual Web Search Engine, Sergey Brin and Lawrence Page explained that they associate link text not only with the page the link is on, but also with the page it points to. That is why anchor text still matters.
A backlink always comes from a different domain. Links between pages of your own site are internal links. They bring no outside trust, but they decide how the trust you earn flows through your site, as I explain in my guide to internal linking for SEO.
How Google uses links: from PageRank to today
Larry Page and Sergey Brin developed PageRank at Stanford University in 1996. The idea is simple: a link counts as a vote, but votes do not weigh the same. A page linked from many pages that themselves rank highly receives a high score, while a link from an unknown page counts for much less.
Google turned off the public PageRank score in its toolbar on April 15, 2016, but the concept did not disappear. The official guide to Google Search ranking systems states that Google uses link analysis systems to understand what pages are about and which might be most helpful, and that PageRank has evolved a lot and continues to be part of its core ranking systems.
The same guide documents the fight against manipulation. A system against link spam, nicknamed the Penguin update, was announced in 2012 and integrated into the core ranking systems in 2016. Today Google relies on SpamBrain, an AI-based spam prevention system, and periodically releases link spam updates.
What Google does not publish is a list of factors with weights. Anyone claiming that backlinks make up a fixed percentage of the algorithm is guessing.
Do backlinks still matter in 2026?
Yes, but not the way they did fifteen years ago. Mass directory submissions, link farms and bulk article marketing once moved rankings. Today they mostly produce links that Google ignores, and in aggressive cases they cost rankings.
Links are still part of the picture. An Ahrefs study of roughly 14 billion pages found that 96.55% of pages in their index get zero traffic from Google, and named three common reasons: no search demand, no backlinks and a mismatch with search intent. This is a correlation, not proof. Pages without links are often also pages without demand or useful content.
My experience matches that nuance. A well structured page that answers a clear question can reach page one without a single backlink, especially for long-tail queries. In competitive topics where dozens of pages are equally good, links often decide which source Google trusts more. What decides the value of a backlink today is where it comes from, the context around it, topical relevance, whether it was given freely and whether the pattern looks like a scheme.
Types of backlinks and the rel attributes explained
Technically, a link is an HTML `<a>` element with an `href` attribute. The Google link best practices say it can only reliably crawl links in this form and that it uses links both to find pages and as a relevance signal. The publisher can add a rel attribute to describe the relationship.
| Link type | Markup | When to use it | How Google treats it |
|---|---|---|---|
| Standard link, often called dofollow | no rel attribute | editorial links you vouch for | fetched and evaluated normally |
| Nofollow | `rel=nofollow` | links you do not want to vouch for | a hint, generally not followed |
| Sponsored | `rel=sponsored` | ads, paid placements, sponsored content | a hint, generally not followed |
| UGC | `rel=ugc` | comments, forum posts, user content | a hint, generally not followed |
Standard links, commonly called dofollow
There is no dofollow attribute in HTML. A so-called dofollow link is a regular link without a rel qualification. The Google documentation on qualifying outbound links confirms that no rel attribute is needed for links you expect Google to fetch and parse without qualifications. These editorial links are the ones that can pass authority.
Nofollow links
Nofollow is for cases where the publisher would rather Google not associate the site with the linked page. It was originally created against comment spam. In September 2019 Google announced that nofollow is evolving: all three values became hints, and from March 1, 2020 nofollow is also a hint for crawling and indexing. A nofollow link is not worthless. One from a major publication can bring visitors, brand awareness and further natural links.
Sponsored links
Paid placements, advertorials and sponsored posts should carry sponsored. Google still accepts nofollow for paid links, but sponsored is preferred. Many companies buy a sponsored article and expect SEO value from it. A correctly qualified paid link brings exposure and referral traffic, not ranking authority. An unqualified one falls under link spam.
UGC links
The ugc value is recommended for comments and forum posts. Google allows removing it for trusted contributors with a history of high-quality contributions. Forum links can bring relevant visitors, but spamming forums for links appears explicitly in the Google spam policies.
Links that appear on every page of another site, typically in a footer or sidebar, are a special case that I analyze in my article on sitewide links.
What makes a good backlink
The most common mistake I see is judging a link only by Domain Rating, Domain Authority or a similar score. These are estimates built by SEO tool vendors, not Google metrics. A high score on an irrelevant page full of paid links can be worth little, while a small specialist site read by the right audience can be extremely valuable.
When I evaluate a link, I look at:
- Topical relevance. If you sell coffee, a link from a barista blog or a food magazine makes sense. A link from a random casino blog does not.
- Authority of the linking site. History, content quality, a real audience and credibility in the topic matter more than one number.
- Placement. A link in the main body, where the author cites your data or guide, usually carries more weight than a footer, sidebar or automatic partner list.
- Anchor text. Descriptive, natural anchors help Google understand the target page. A profile where almost every link uses the same commercial keyword looks engineered. The right mix is covered in my guide to anchor text in SEO.
- Real traffic. A page nobody reads and that has no visibility in Google passes limited value. Link farms typically look exactly like this.
- Indexation. If the page with your link is not in the Google index, its SEO contribution is close to zero, and paid shortcuts rarely fix that, as I show in how guaranteed indexing tools work.
- Naturalness. The best link would exist even if Google did not.
| Strong backlink | Weak backlink | |
|---|---|---|
| Source | relevant site with a real audience | random, spammy or link farm site |
| Placement | main content, next to related text | footer, sidebar, bulk list, profile page |
| Anchor text | natural, descriptive or branded | repeated exact-match keyword |
| Linking page | indexed and visible in search | not indexed, no traffic |
| Origin | earned through content or relationships | bought in a cheap package |
| Risk | none | ignored at best, policy violation at worst |
Paid links, link spam and what Google penalizes
The Google spam policies define link spam as creating links to or from a site primarily to manipulate search rankings. Examples include:
- buying or selling links, or exchanging goods or services for links
- excessive link exchanges and partner pages built only for cross-linking
- automated programs or services that create links to your site
- low-quality directory and bookmark site links
- keyword-rich or hidden links in widgets and widely distributed footer or template links
- forum comments with optimized links in the post or signature
Advertising itself is not the problem. Google states that paid links do not violate its policies as long as they are qualified with nofollow or sponsored.
There is also a legal side. In the European Union, the Unfair Commercial Practices Directive lists advertorials, meaning paid editorial content not clearly identified as paid, among practices that are unfair in all circumstances. In the United States, the FTC guidance on endorsements expects material connections between publisher and advertiser to be disclosed. A hidden paid link can be both a Google policy violation and a consumer protection issue.
When Google detects link spam, its systems usually neutralize the links. The Google page on spam updates makes one point that surprises many site owners: once the effect of spammy links is removed, any ranking benefit they generated is lost and cannot be regained. In serious cases a reviewer can issue a manual action, and the Manual actions report in Search Console explains how to clean up unnatural links and request a review.
For the record, I built wooacademy.sk to a Domain Rating above 50 without buying a single backlink. The links came from content people wanted to cite, not from a price list.
Toxic backlinks: when to worry and when to relax
Every site collects strange links. Scrapers copy content, aggregators list pages, hacked sites carry spam links to random domains. Hundreds of odd domains in Search Console do not mean you are in trouble, because Google can generally assess which links to trust on its own.
Treat the toxicity score in SEO tools as a prompt for manual review, not a verdict. I have seen audits where half of the flagged links were normal mentions from small blogs. Real warning signs look different:
- a manual action for unnatural links in Search Console
- a sudden spike of links from unrelated sites with commercial anchors
- links you know came from a past paid campaign or a private blog network
- a drop in organic traffic that coincides with a link spam update
A competitor can try negative SEO, but Google systems are built to neutralize such links, and stable sites with a natural profile are rarely affected. A more realistic risk is your own site being hacked and used to host injected spam links, one reason I insist on secure development practices in WordPress and WooCommerce.
The disavow tool: most sites do not need it
The disavow tool asks Google not to take certain links into account. The official disavow links documentation says most sites will not need it. Google recommends disavowing only when both conditions apply: you have a considerable number of spammy, artificial or low-quality links, and they have caused a manual action or likely will.
Practical details:
- a plain .txt file in UTF-8 or 7-bit ASCII, one URL or one `domain:example.com` entry per line
- a limit of 100,000 lines and 2 MB
- processing can take a few weeks as Google recrawls the web
- disavowed links still appear in the Links report
- Domain properties are not supported, so you need a URL-prefix property
How to audit your backlink profile step by step
This is the process I use when a client asks whether their links help or hurt, mostly with free Google tools.
1. Open the Links report in Search Console
The Links report shows your top linked pages, top linking sites and top linking text. It is a sample, tables are capped at 1,000 rows and it does not show whether a link is nofollow.
2. Export the data and group it by domain
The export on the landing page provides up to 100,000 rows. Group links by linking domain, because ten links from one site matter far less than links from ten different relevant sites.
3. Check the Manual actions report
If there is no manual action for unnatural links, you are almost certainly not in a situation that requires disavow.
4. Rate the most important linking domains
For each top domain, ask whether it is relevant, whether it has real content and visitors, whether your link sits in the main content and whether it would make sense to a reader who ignores SEO. Mark each as strong, neutral or suspicious.
5. Review the anchor text distribution
A healthy profile is dominated by your brand name, URLs and descriptive phrases. If one commercial keyword dominates, find out where those links came from.
6. Check where your authority flows internally
Compare your top linked pages with your money pages. If your strongest links point to articles that never link to your services or categories, add internal links. This step often brings more than new links.
7. Decide what to keep, remove or disavow
Keep strong and neutral links. For links you paid for or that come from schemes, ask the site owner to remove them or add a rel qualification. Disavow the rest only if the Google conditions apply.
8. Monitor on a schedule
A quarterly review is enough for a small site. For larger ecommerce or competitive sites, check new and lost referring domains, anchor text and manual actions monthly against organic traffic.
Backlinks and AI search
AI Overviews, AI Mode, ChatGPT search and Perplexity changed how people find answers. Google states in its documentation on AI features in Search that there are no additional requirements to appear in AI Overviews or AI Mode and that SEO best practices remain relevant. To be shown as a supporting link, a page must be indexed and eligible to appear in Search with a snippet.
Two consequences follow. Everything that helps a page get discovered, indexed and trusted in classic search, links included, also helps it become eligible for AI answers. But a link alone does not make an AI system cite you. Language models pull passages that answer a question clearly and pay attention to how and where your brand is mentioned across the web, even without a link, which I explain in my article on brand mentions and AI citations.
For AI visibility, the most valuable links and mentions are citations of your own data or case studies, mentions in trusted topical sources, expert commentary under a named author and links from partners, associations and industry media. They work best when they support content worth quoting, which I describe in how to write content AI cites, on a site AI crawlers can access, covered in technical SEO for AI search. For the full picture, start with my AEO strategy for getting recommended by AI.
How good backlinks are actually earned
Healthy link building does not start with where to buy links. It starts with why anyone should link to you. Original data, case studies, free tools, in-depth guides and expert commentary attract links naturally. So do relationships: partners that list you, associations you belong to, journalists who need a quote and publishers whose broken links you can help replace.
Before investing in outreach, make sure you have something worth linking to and that your pages are indexed. I walk through the tactics that still work in how to get backlinks in the age of AI search, and if new pages struggle to get into the index, my overview of the best Google indexing tools shows what is worth using.
At WooAcademy, I help companies in the EU and the US understand what their backlink profile really does for them. That usually means a technical SEO audit, a backlink review and an AI search visibility audit, delivered remotely, with clear priorities instead of a list of links to buy. If your rankings or AI citations are stuck and you are not sure whether links are the reason, I am happy to take a look.
FAQ
What is a backlink in simple terms?
A backlink is a link on another website that points to your website. Search engines treat it as a recommendation, similar to a citation in academic work. A backlink from a relevant, trusted site can help Google discover your page, understand its topic and judge how far it can be trusted, while a link from a spammy or unrelated site usually adds little or nothing.
Are backlinks still a ranking factor?
Yes. Google documents that it uses link analysis systems, including an evolved version of PageRank, as part of its core ranking systems. It does not publish how much weight links carry, and content that matches search intent can rank without backlinks in less competitive topics. In competitive topics, relevant links from trusted sources often separate equally good pages.
What is the difference between nofollow, sponsored and ugc?
All three are values of the rel attribute. Sponsored marks ads and paid placements, ugc marks links in comments and forum posts, and nofollow covers any other link the publisher does not want to vouch for. Since March 1, 2020, Google treats all three as hints. A standard link without any rel attribute is what SEO people call a dofollow link.
Is buying backlinks against Google rules?
Buying links that pass ranking signals is link spam under the Google spam policies. Paid placements are allowed when the link is qualified with sponsored or nofollow. In the EU and the US, unmarked paid content can also conflict with consumer protection rules on advertorials and disclosure, so a correctly labeled sponsored link is the safe option.
How many backlinks do I need to rank?
There is no universal number. It depends on competition, topic and keyword. Some local services rank with a handful of relevant links, while competitive ecommerce categories may need many linking domains. The most reliable method is to check which sites link to the pages ranking in the top ten for your keyword and compare quality and relevance, not only the count.
Should I disavow toxic backlinks?
Usually not. Google says most sites never need the disavow tool. It makes sense when you have a considerable number of spammy or artificial links, typically from a past paid campaign, that have caused or are likely to cause a manual action. Disavowing based on an automated toxicity score can remove links that were helping you.
How can I check my backlinks for free?
Use the Links report in Google Search Console. It shows your top linked pages, top linking sites and most common anchor text, with an export of up to 100,000 rows. The data is a sample and does not mark nofollow links, so for deeper analysis you can add a third-party backlink tool, remembering that its authority scores are estimates, not Google metrics.
