What Are Backlinks? Why Link Quality Makes the Difference in SEO

Backlinks come up in almost every first SEO call I have with a new client. Some people open with "we need 500 links by next quarter." Others want to know why their rankings dropped after a cheap link package. In this guide I explain what backlinks really are, how Google reads them and how you can tell a valuable link from a risky one. I also cover paid links, the nofollow, sponsored and ugc attributes, and the disavow tool, all based on Google's own documentation.

What are backlinks and why do they matter for SEO?

Backlinks are clickable links from another website that point to a page on your site. Google uses them to discover new pages and to judge how relevant a page is for a topic. Therefore relevant, editorially earned backlinks can support your rankings, while manipulative links add risk instead of value.

Google says this plainly. According to its link best practices page, Google uses links as a signal when it determines the relevancy of pages and to find new pages to crawl. In other words, a backlink is not a ranking guarantee. However, combined with strong content, it remains one of the oldest signals that shapes how search engines see your site.

How does Google actually read a link?

First, Google has to be able to crawl the link. The documentation states that Google can only crawl a link if it is an a element with an href attribute. A button that relies on a JavaScript click handler does not count, even if it takes users to your page. So the way another site codes its mention of you matters.

Then comes the second layer, context. The surrounding text, the anchor text and the topic of the linking page all give Google hints. For example, a link inside a trade magazine's project review says far more than a footer link on an unrelated coupon site. After that comes the third layer, intent. Google treats links that exist mainly to manipulate rankings as a separate category and handles them through its spam policies.

In short, Google weighs links rather than counting them. My own field experience points the same way: sites with fewer backlinks from the right sources often outrank sites with much larger profiles. That is an observation, not a rule. Still, I recommend that you plan around sources, not numbers.

What makes a backlink high quality?

No official quality score for backlinks exists. Third party "authority" metrics are estimates from tool vendors, not numbers Google uses. For that reason I review every link with a short set of questions:

• Topical fit: Does the linking site serve your industry or your audience?
• Editorial choice: Did an editor or author add the link freely, or did someone pay for it?
• Real traffic: Do people read the page, and do any of them click through to you?
• Context: Does the link sit inside a meaningful sentence in the main content?
• Natural anchor text: Is the anchor your brand name or a plain description of the topic?
• Clean source: Does the site look like part of a network that links to anyone who pays?

If you cannot answer yes to at least four of these, the link probably adds little. Also keep one test in mind. Would a real reader want to click this link? If the answer is no, do not expect Google to give it much weight either.

Timing matters too. A natural profile grows unevenly: a news story mentions you, a few quiet weeks follow, and then an industry post links to your guide. In contrast, the same number of similar links every single month looks like a schedule. For example, a brand new site with hundreds of links in its first month, before it has much content, raises an obvious question. So judge quality by pace and pattern as well as by source.

How can you tell a valuable link from a risky one?

When I audit a client's backlink profile, I use the comparison below. It is not a scoring system. Instead, it summarises the signals worth checking.

One signal from the right column does not always mean trouble. For example, a single old forum signature rarely hurts. However, when the same pattern repeats across hundreds of links, the whole profile starts to look artificial. That is why I look at the overall pattern first and individual links second.

What does Google's link spam policy prohibit?

In its spam policies for Google web search, Google defines link spam as creating links to or from a site primarily to manipulate search rankings. The examples in the policy cover nearly every mistake I meet in practice:

1. Buying or selling links for ranking purposes, including paying for posts that contain links.
2. Excessive link exchanges, or partner pages that exist only for cross linking.
3. Using automated programs or services to create links to your site.
4. Text ads or text links that do not block ranking credit.
5. Advertorials where payment buys articles with optimised anchor text links.
6. Low quality directory or bookmark site links.
7. Keyword rich, hidden or low quality links inside widgets that others embed.
8. Forum comments with optimised links in the signature.

Notice the common thread: intent. The same link becomes acceptable once you clearly label it as an ad. So the real question is not "does this link exist?" Rather, it is "does this link exist mainly to move rankings?"

Why is buying backlinks risky?

Google does not ban paid links outright. According to the policy, a paid link that carries rel="nofollow" or rel="sponsored" complies with the rules. In other words, advertising is fine. The problem starts when someone removes that label on purpose so the link passes ranking credit.

The risks I see with purchased backlinks fall into three groups:

• No effect: Google can recognise these links algorithmically and ignore them. Your money then turns into zero signal.
• Manual action: The policy says Google detects violations through automated systems and, as needed, human review. Affected sites may rank lower or disappear from results.
• Clean up cost: The links stay online even after you cancel the package. Removal requests and audits can cost more effort than the package itself.

There is also a quieter cost, which is the budget itself. Had you spent the same money on content, technical fixes or genuine promotion, you would own a lasting asset. So whenever a client receives a "fast backlinks" offer, I tell them to ask for the full source list first. If the vendor refuses, walk away.

What did SpamBrain and the link spam updates change?

SpamBrain is Google's AI based spam prevention system. In its December 2022 link spam update announcement, Google explained that SpamBrain can now detect both sites buying links and sites used for passing outgoing links. The same post described the goal as neutralising the impact of unnatural links on search results.

That also has a practical consequence. A neutralised link does not penalise you, but any credit it used to pass disappears. As a result, a site that climbed on a link package may feel "penalised" after an update. In most cases, though, the artificial support has simply switched off.

My takeaway is simple. Every gain that depends on fooling the algorithm is temporary, and Google recognises these patterns better with each update. Therefore I advise clients never to build their visibility on signals that the next update can erase.

Can the links you give out also put your site at risk?

Yes. The link spam definition covers links to or from a site, so it applies to outbound links too. If you publish paid articles on your site and leave their links unlabelled, you become the seller in the transaction.

I see two common problems. First, open comment sections and forums attract spam links from users. The ugc attribute and steady moderation handle most of that. Second, "guest post" pitches often ask for a link with the same commercial anchor in every article. When such a pitch arrives, ask whether the article genuinely helps your readers. If it does not, decline. If it does, publish the link with a natural anchor and add sponsored where money or goods changed hands.

In short, the links you hand out also shape how trustworthy your site looks. That is why I recommend a short written policy for outbound links, especially if several people publish on your site.

What is the difference between nofollow, sponsored and ugc?

These three values go into the rel attribute of an a tag and tell Google what kind of link it is looking at. Google's guide to qualifying outbound links describes them this way:

• rel="sponsored": For links that are ads or paid placements. Google prefers this value for paid links.
• rel="ugc": For links inside user generated content, such as comments and forum posts.
• rel="nofollow": For cases where the other values do not apply and you would rather Google not associate your site with the linked page.

You can also combine values in a space or comma separated list, for example rel="ugc nofollow". Nofollow remains an acceptable way to flag paid links, although Google prefers sponsored. If you run a publication that sells advertorials, make this labelling a default rule in your CMS rather than a manual step.

Why are these attributes hints rather than strict rules?

In September 2019, Google announced in its "Evolving nofollow" post that it would treat all three values as hints rather than directives. The same post said nofollow would also become a hint for crawling and indexing from March 1, 2020. So Google may still use a flagged link for discovery when it sees a reason to.

As a result, this change clears up two myths. The first says that nofollow links have no value at all. Even without ranking credit, such a link can bring traffic, brand awareness and discovery. The second says that nofollow keeps Google away from a page. If you want a page out of the index, the right tool is a noindex rule, not nofollow.

In practice, I consider a mix of followed and nofollow links perfectly healthy. A profile made only of followed links, especially on a young site, looks unusual.

How should anchor text look?

Anchor text is the visible, clickable text of a link. Google's link documentation recommends that it be descriptive, reasonably concise and natural. Generic phrases like "click here" or "read more" tell neither readers nor search engines anything useful. On the other hand, the same page also warns against cramming every keyword into anchors.

With backlinks, you usually do not choose the anchor, and that is a good thing. A natural profile mixes your brand name, your domain, page titles and plain descriptions of the topic. By contrast, hundreds of links with the same commercial phrase point to a campaign. The advertorial example in the spam policy describes exactly that pattern.

Internal links are different, because you control the anchor fully. There you can use descriptive phrases close to your target terms. To decide which phrase belongs to which page, I suggest you start from the method in my guide on how to find keywords that drive sales.

How do you spot and lift a manual action?

A manual action means a human reviewer at Google decided your site violates the policies. You will see an entry in the Manual actions report in Search Console. Link related entries usually read "unnatural links to your site" or "unnatural links from your site".

If you find one, work through these steps in order:

1. Open the report and check the scope: the whole site or specific sections?
2. Export a full link list from the Links report and any tools you use.
3. Flag every paid, swapped or automatically created link.
4. Contact site owners and ask them to remove the link or add a proper attribute.
5. Prepare a disavow file for the links you cannot remove.
6. Document every step and submit a reconsideration request.

Above all, be specific and honest in that request. Explain what you did, whom you contacted and how you will prevent a repeat. A short "we fixed it" note often leads to a second round.

When should you use the disavow tool?

The disavow tool lets you ask Google to ignore specific links. However, Google's help page calls it an advanced feature that you should use with caution. According to that page, you should use it only when two conditions hold together. You have a considerable number of spammy, artificial or low quality links, and those links have caused a manual action or likely will.

Misuse can hurt your performance, because you may throw away good links by accident. Keep these format rules in mind when you prepare the file:

• Put one URL or one domain on each line, and use the domain: prefix for a whole domain.
• Start comment lines with #.
• Save the file as .txt in UTF-8 or 7 bit ASCII.
• Stay within 100,000 lines and 2 MB.
• Note that you cannot disavow a subpath such as example.com/en/.

Google notes that it can take a few weeks before your list takes effect. So do not keep editing the file while you wait for results.

How do you audit your backlinks?

First, start with a free source: the Links report in Search Console. It shows your top linking sites, your most linked pages and your most common linking text. The report gives a sample, not a complete list. Even so, it is the closest view you get to what Google sees.

I follow a fixed order. First, I open the top linking sites one by one and decide whether each is a real publication or a link network. Next, I group the anchor texts and look for repeated commercial phrases. Finally, I check that the most linked pages still work.

Teams often skip that last step, yet it matters a lot. A backlink that points to a deleted or moved page goes to waste without a redirect. With the redirect checker you can quickly confirm that those URLs reach the right target with a 301. If a relaunch is coming up, the redirect map step in my guide on protecting SEO during a website redesign prevents that loss.

What are reliable ways to earn backlinks naturally?

A natural backlink appears when someone decides you are worth recommending to their own readers. So do not start with "how do I get links?" Start with "why would anyone link to us?" These approaches have worked most consistently for my clients:

• Reference content: Original data, thorough guides, industry specific calculators or checklists.
• Free tools: A small calculator that solves a real problem can attract links for years.
• Expert commentary: Quick, clear answers to journalists and trade editors.
• Real relationships: Suppliers, partners, associations and event organisers.
• Broken link opportunities: Offer your current resource where an industry page links to a dead one.

None of these is fast. In my field experience, the first meaningful editorial links tend to arrive within a few months; treat that as a starting expectation, not a guarantee. On the other hand, every link you earn this way lasts and will not scare you at the next update.

When do digital PR and partnerships work?

Digital PR means taking a newsworthy story to the publications that care about it. Done well, it brings links and brand awareness at the same time. For example, if you run an industry survey and publish the results openly, editors who follow that industry will link to you as the source.

The line here needs to be clear. Paying a publication to run a sponsored article is a legitimate form of advertising. However, the links in that article need sponsored or nofollow. Otherwise you fall under the advertorial example in the policy. Therefore make sure your agency or PR team understands this distinction.

These partnerships have another benefit too. AI assistants also learn about brands largely from mentions on trusted sources. I cover that in detail in my article on how your brand shows up in ChatGPT and Gemini. In short, good PR creates visibility well beyond the link count.

How do ecommerce sites earn backlinks?

Online shops find earning backlinks harder, because product pages rarely carry news value. Nobody links to a product listing just because it exists. So in stores I recommend pulling links toward helpful content instead. For example, a sizing guide, a care manual or a comparison table can do that job.

A second route runs through manufacturers and brands. If you are an authorised retailer, a place on the brand's "where to buy" page is both natural and relevant. A third route is genuine reviews. When you send products to a publication or creator, agree on the link attribute up front. A review in exchange for free goods counts as a paid placement and needs sponsored.

Also watch out for short lived product pages. If you delete a page when stock runs out, its backlinks go to waste. Instead, redirect it to the closest category. If you want to plan store growth as a whole, have a look at my ecommerce consulting service.

How do backlinks differ for local businesses?

For a local business, backlinks work within a narrower but clearer field. Chambers of commerce, local news sites, professional bodies and neighbourhood associations may look small. Still, they send a strong signal about your area. For example, an interview in a district newspaper means more to a dental clinic than a listing in an unrelated national directory.

In addition, local links help keep your business details consistent. When your name, address and phone number appear the same way across sites, both users and Google can confirm you more easily. I cover this together with map visibility in my guide on how to do Google Maps SEO.

That said, be wary of "submit to thousands of local directories" packages. The low quality directory example in the policy covers exactly this kind of bulk submission. A few real, relevant listings do more than hundreds of empty directory pages.

Can internal links replace backlinks?

No, but they amplify them. External links usually land on your home page or a popular article. If that page links well to your key service pages, you spread the value across the rest of your site. That is why I plan link earning and site architecture together.

In practice, here is a quick check. Do your five most linked pages link to the pages that actually convert? In most projects I review, they link to none of them. Also, deeply buried pages can stay in the background for crawling even when they earn external links. On large sites you can fix that structure with the approach in my category structure guide.

How do you measure success with backlinks?

Counting backlinks is the most common measurement mistake. In client reports I track several indicators together: organic impressions and clicks for linked pages, referral traffic, enquiries from that traffic and average position for target terms. That way you see whether backlinks actually bring business.

Third party domain scores can give you a rough idea. Still, they come from each tool's own formula, not from Google. Use something like the domain value calculator for orientation, not as a goal. If a score rises while traffic stays flat, you may be investing in the wrong links.

Next, set the right time frame. Link impact usually shows up with a delay, so quarterly trends tell you more than monthly swings. If you hire a consultant, ask how they will report from day one. My checklist before hiring SEO and Google Ads consultants gives you a good starting point for that conversation.

Do you need a consultant for backlinks?

Not every business needs a dedicated link specialist. A small company with strong content and active industry ties can apply the methods above with its own team. By contrast, companies with a history of link packages, a past manual action or a highly competitive market usually save time with outside help.

When you choose a consultant, ask one question first: "Where and how will you get these links?" Any offer that hides its sources, guarantees a number of links or promises rankings carries every risk in this article. I also discuss which companies truly need this kind of support in my post on who needs enterprise SEO consulting.

In my SEO consulting work, link earning is not a separate package. Instead, it grows out of content and technical work. If you would like to review your profile together, you can reach me through the contact page.

Summary: which principles should guide your backlink strategy?

The core of this guide comes down to a few principles. Google weighs links rather than counting them. Paid links are fine, but they need sponsored or nofollow. SpamBrain neutralises artificial links, so any boost from a link package is temporary. And the disavow tool belongs only in situations with a real problem.

The approach that works long term never changes. Create content worth linking to, build real relationships and measure results through traffic and enquiries. It feels slow, yet every backlink you earn this way will still stand after the next algorithm update.