Backlinks: What They Are and Why They Still Matter

ByKeith Lacy
What Exactly Is a Backlink?Why Search Engines Use Backlinks as a Ranking SignalThe Difference Between a Good Backlink and a Worthless OneThe Types of Backlinks That Actually Appear in the WildHow to Read Your Own Backlink ProfileWhat Makes a Backlink Strategy SustainableCommon Misconceptions About Backlinks

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A backlink is a hyperlink on one website that points to a page on another website. When a third-party site links to your content, that link is a backlink. Search engines treat these links as signals of credibility, using them to help determine how much authority a page carries and, in turn, where it ranks.

The concept has been central to how Google evaluates content since the late 1990s, and despite decades of algorithm updates, it has not gone away. The mechanics have become more nuanced, the quality thresholds have risen, and the penalties for manipulation have sharpened. But the underlying logic remains intact: a link from a reputable source is still one of the clearest signals that your content is worth ranking.

Key Takeaways

  • A backlink is any external hyperlink pointing to your site. Not all backlinks carry the same weight, and some carry none at all.
  • Link quality is determined by the authority, relevance, and trustworthiness of the linking domain, not just the volume of links pointing to your site.
  • Anchor text matters, but over-optimising it is a well-documented way to attract a Google penalty rather than rankings.
  • The most durable backlink strategies are built around content worth linking to, not outreach scripts and link exchanges.
  • Local businesses, e-commerce sites, and B2B publishers all need backlinks, but the types that move the needle differ significantly by context.

In This Article

  1. What Exactly Is a Backlink?
  2. Why Search Engines Use Backlinks as a Ranking Signal
  3. The Difference Between a Good Backlink and a Worthless One
  4. The Types of Backlinks That Actually Appear in the Wild
  5. How to Read Your Own Backlink Profile
  6. What Makes a Backlink Strategy Sustainable
  7. Common Misconceptions About Backlinks

Strip away the SEO vocabulary and a backlink is simply a link. When a journalist writes a piece on a news site and references your report, linking to it, that is a backlink. When a blogger recommends your product and hyperlinks to your product page, that is a backlink. The word “back” refers to the direction: the link travels back to your domain from somewhere else on the web.

The HTML behind it is straightforward. A linking page contains an anchor tag with an href attribute pointing to your URL. The visible, clickable text is called anchor text. That anchor text is a data point in its own right. If dozens of sites link to your page using the phrase “best project management software,” search engines register that pattern. It reinforces what your page is about and can contribute to ranking for that phrase. It can also, if done artificially at scale, trigger a manual or algorithmic penalty. More on that shortly.

There are also two technical attributes that change how much weight a backlink carries. A “dofollow” link passes authority from the linking page to yours. A “nofollow” link includes a tag instructing search engines not to follow it or pass link equity. Most editorial links are dofollow by default. Links in press releases, sponsored content, and user-generated content are typically nofollow, or should be. Google has also introduced more granular attributes: “sponsored” for paid placements and “ugc” for user-generated content. These distinctions matter for how you assess your link profile and how you build it.

If you want to understand how backlinks sit within a broader ranking framework, the Complete SEO Strategy hub on this site covers the full picture, from technical foundations to content and authority-building.

Before Google, search engines ranked pages primarily by matching keywords on the page to the query. The problem was obvious: anyone could stuff a page with keywords and rank for anything. Google’s original insight was that links could act as votes. If many credible sites linked to a page, that page was probably more authoritative than one nobody had bothered to reference.

The logic holds because links are harder to fake at scale than on-page content. Writing keyword-dense copy takes minutes. Building a network of genuine, editorially placed links from authoritative domains takes months or years. That friction is part of what makes the signal valuable.

I spent several years managing large-scale SEO campaigns at iProspect when we were scaling the agency from around 20 people to over 100. One of the clearest lessons from that period was that clients who had invested in genuine authority, through research, data, or content that the industry actually referenced, consistently outperformed clients who had chased link volume through directories and article spinning. The gap was not subtle. It showed up in rankings, in traffic, and eventually in revenue. The clients who had cut corners were also the ones scrambling when Google’s Penguin update arrived.

The Crazy Egg overview of backlinks does a reasonable job of explaining the foundational mechanics if you want a second perspective on how the signal works in practice.

Volume is the wrong metric. A single link from a well-regarded industry publication is worth more than a hundred links from low-traffic, low-authority directories. This is not a controversial claim, but it is one the industry spent years ignoring because volume was easier to sell to clients than quality.

Several factors determine how much value a backlink actually carries.

Domain authority. This is a proxy metric, not a Google metric. Moz, Ahrefs, and Semrush all have their own versions of it. The underlying principle is sound even if the specific scores vary: a link from a site with a strong, well-established backlink profile of its own passes more value than a link from a brand-new site with no inbound links.

Topical relevance. A link from a marketing trade publication to a marketing agency’s blog is more relevant than a link from a food blog to the same agency. Search engines assess the topical relationship between the linking page and the linked page. Relevance amplifies authority.

Editorial placement. A link embedded naturally within the body copy of an article is worth more than a link in a footer, a sidebar, or a site-wide navigation element. The editorial context signals that someone made a deliberate choice to reference your content.

Anchor text. Descriptive, contextual anchor text is more useful than generic phrases like “click here” or “read more.” But exact-match anchor text used repeatedly across many links is a red flag. Search Engine Journal has covered the risks of over-optimising anchor text in detail, and it is worth reading if you are managing a link-building programme.

Link freshness. A link from a page that was published recently and is still being crawled regularly tends to carry more active value than a link buried in content that has not been touched in years.

Semrush has a useful breakdown of the different types of backlinks and how they differ in terms of SEO value, which is worth bookmarking if you are auditing a link profile for the first time.

Not all backlinks are created through the same mechanism, and understanding the source matters for both strategy and risk assessment.

Editorial links are the gold standard. A journalist cites your data. A blogger recommends your tool. An industry analyst links to your report. These are unsolicited, contextual, and hard to manufacture. They are also the type of link that has the most durable value over time.

Outreach-generated links are links you earn through deliberate contact with publishers, bloggers, or journalists. When done well, this is legitimate. You identify a piece of content that would benefit from referencing your resource, you reach out with a clear, specific reason why, and occasionally it works. When done badly, it is spam with a polite subject line. The industry has a problem with the latter.

Guest post links involve contributing content to another site in exchange for a link back to yours. Google’s guidance on this has tightened considerably. Links in guest posts are supposed to be nofollowed unless the content is genuinely editorial and the link is contextually appropriate. In practice, large-scale guest posting programmes built primarily for link acquisition are a risk.

Directory and citation links are standard for local businesses. Listings in Google Business Profile, Yelp, industry-specific directories, and local chamber of commerce sites all contribute to local SEO authority. Semrush’s guide to local SEO backlinks covers this well, particularly for businesses where geographic relevance is a ranking factor.

Government and institutional links carry significant weight because of the inherent authority of the domains. A .gov or .edu link is not automatically more valuable than any other link, but these domains tend to have strong, well-established authority profiles. Crazy Egg’s breakdown of .gov backlinks explains how these links are earned and why they matter.

Toxic links are backlinks from spammy, low-quality, or manipulative sources. These can accumulate naturally over time, particularly for older domains. In severe cases, a pattern of toxic links can suppress rankings. Google’s Disavow tool exists for this reason, though it should be used carefully and not as a first response to a mild link profile issue.

Before building links, you need to understand what you already have. Every serious SEO tool, Ahrefs, Semrush, Moz, gives you a backlink report. What you are looking for is a picture of where your authority is coming from, where it is concentrated, and where the risks are.

Start with referring domains, not raw link count. A site with 500 links from 500 different domains is in a healthier position than a site with 5,000 links from 10 domains. Diversity of linking domains is a signal of organic, natural link acquisition.

Look at the anchor text distribution. If a large proportion of your backlinks use the same exact-match keyword phrase as anchor text, that is a pattern worth investigating. Natural link profiles have varied anchor text: branded mentions, generic phrases, partial matches, and some exact matches mixed in.

Check which pages are receiving the most links. Often, the distribution is uneven. A few pages attract the majority of backlinks while the rest of the site has very little external authority pointing to it. This matters for internal linking strategy: you can pass some of that authority to other pages by linking internally from your strongest pages to the ones you want to rank.

When I was running agency-side SEO audits for large retail clients, the backlink report was always one of the first documents I presented to a new client. Not because it told the whole story, but because it told you something about the history of the site and the decisions that had been made. A site with thousands of links from article directories and link farms had a different conversation ahead of it than a site with a clean, editorially earned profile. The audit shaped the entire strategic conversation. Moz’s guidance on presenting SEO projects is useful if you are in the position of having to translate a backlink audit into a client-facing recommendation.

Ahrefs has also published a 2025 webinar on backlinks and brand mentions that covers how the relationship between unlinked mentions and linked citations is evolving. Worth watching if you manage a brand with significant media coverage that is not being fully captured as link equity.

The industry has a long history of chasing tactics that work briefly and then stop working, often with collateral damage. Link farms, private blog networks, paid links disguised as editorial content, and bulk directory submissions all had their moment. They also all contributed to Google algorithm updates that penalised the sites that relied on them.

I have a low tolerance for the hype cycle around link building. Every few years, a new approach gets repackaged and sold as a breakthrough. The fundamentals have not changed: earn links by producing content that is genuinely worth referencing, build relationships with publishers in your space, and do not try to manufacture at scale what should happen organically over time.

The most sustainable backlink strategies share a few common characteristics.

They start with content that has a reason to be linked to. Original research, proprietary data, well-structured reference content, and tools that solve a specific problem all attract links because they are useful. Generic blog posts do not. If you cannot articulate why someone would link to a piece of content before you write it, the outreach campaign you build around it will be a waste of time.

They involve genuine relationship-building with publishers and journalists in the relevant industry. This takes longer than sending 200 cold emails, but the links it produces are more durable and more valuable. Journalists who trust you as a source will reference you again. A link from a cold outreach campaign is a one-time transaction.

They are patient. A site that earns 20 high-quality links per year from relevant, authoritative sources is in a stronger position after three years than a site that bought 500 links in year one and has done nothing since. The compounding effect of consistent, quality link acquisition is real.

They are monitored. Link profiles change. New links appear, old links disappear, and occasionally a toxic link appears from a source you never approached. Regular monitoring means you catch problems before they accumulate.

Backlinks are one part of a broader organic search strategy, not a standalone solution. If you are building a complete approach to SEO rather than optimising individual tactics in isolation, the Complete SEO Strategy hub on this site is the right place to start.

A few persistent myths are worth addressing directly.

More links always means better rankings. It does not. A site with 10,000 links from low-quality sources will typically underperform a site with 200 links from authoritative, relevant domains. Quality is the variable that matters, not volume.

Nofollow links have no value. This is an oversimplification. Nofollow links do not pass direct link equity in the traditional sense, but they contribute to a natural-looking link profile, they can drive referral traffic, and Google has indicated that it treats nofollow as a hint rather than a strict directive. Ignoring nofollow links entirely misses part of the picture.

You can rank without backlinks. For some low-competition queries, you can. For competitive commercial terms, the correlation between ranking position and backlink authority is strong enough that treating links as optional is a strategic error. There are exceptions, particularly in very niche verticals, but they are exceptions.

Disavowing links is a routine maintenance task. It is not. The disavow tool is for sites that have a genuine problem with manipulative or toxic links at scale. Using it speculatively on links that are simply low-quality but not harmful can do more damage than leaving them alone. Use it when you have clear evidence of a problem, not as a precautionary sweep.

Anchor text should be optimised for keywords. Anchor text should reflect the context of the link naturally. Optimising it artificially is a pattern Google has been able to identify for years. I have seen campaigns that built what looked like a strong link profile on paper, only to find that the anchor text distribution was so obviously manipulated that it was flagging risk rather than building authority. The fix was expensive and slow.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what works.

Frequently Asked Questions

What is the difference between a backlink and an internal link?
A backlink comes from an external domain pointing to your site. An internal link connects one page on your site to another page on the same site. Both matter for SEO, but they serve different functions. Backlinks build external authority. Internal links distribute that authority across your site and help search engines understand the relationship between your pages.
How many backlinks do you need to rank on the first page of Google?
There is no fixed number. The right answer depends on the competitiveness of the query, the quality of the linking domains, and how your backlink profile compares to the pages currently ranking above you. For some niche queries, a handful of strong links is enough. For competitive commercial terms, you may need dozens of authoritative links before you see meaningful movement. Benchmarking against your actual competitors is more useful than targeting an arbitrary number.
Do social media links count as backlinks?
Social media platforms typically add a nofollow attribute to outbound links, which means they do not pass direct link equity in the traditional sense. They are not counted as backlinks in the way editorial links are. That said, content that performs well on social media tends to attract editorial links from people who discover it there, so social distribution has an indirect effect on backlink acquisition.
Can bad backlinks hurt your rankings?
In most cases, a small number of low-quality links will not materially harm a site. Google is generally good at ignoring links it considers irrelevant or spammy. The risk increases when a site has a large volume of clearly manipulative links, particularly if those links were built deliberately as part of a link scheme. In that scenario, a manual penalty or algorithmic suppression is possible. Regular monitoring of your backlink profile helps you identify problems before they reach that threshold.
What is the fastest way to build backlinks?
The fastest legitimate approaches are digital PR, broken link building, and creating data-led content that journalists and bloggers want to reference. Digital PR, where you create a story or dataset with genuine news value and pitch it to relevant publications, can generate multiple editorial links from a single campaign. Broken link building involves finding dead links on relevant sites and suggesting your content as a replacement. Neither is instant, but both produce results faster than waiting for organic discovery alone.

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