What is Backlinks?

What Are Backlinks?

Backlinks are hyperlinks on external websites that point to a page on your website. When a blog links to your article, when a news site references your data, when a directory lists your business — each of those is a backlink.

Google’s ranking system was built on this concept from day one. The original PageRank algorithm treated every link as a recommendation. That core idea hasn’t changed, even as the algorithm has grown more sophisticated.

A study of 11.8 million Google search results found that the number one result has 3.8x more backlinks than positions two through ten. That’s not a coincidence. It’s how search works.

Why Do Backlinks Matter?

Backlinks remain one of Google’s top ranking factors — alongside content quality and search intent alignment. Here’s why they carry so much weight:

• Authority signal — Each quality backlink tells Google that another site trusts your content enough to send their audience to it
• Faster indexing — Pages with backlinks get discovered and indexed faster by Googlebot because crawlers follow links to find new content
• Referral traffic — Links from popular sites send real visitors to your pages, not just ranking signals
• Topical relevance — Backlinks from sites in your niche reinforce your expertise on that subject. A dentistry blog linking to your dental marketing guide carries more weight than a random tech site linking to it.

Without backlinks, even great content struggles to rank for competitive keywords. That’s the hard truth of SEO.

How Backlinks Work

Google Evaluates Quality, Not Just Quantity

Ten links from authoritative, relevant websites will outperform a thousand links from low-quality directories. Google’s algorithm weighs several factors when evaluating a backlink:

• Source authority — A link from the New York Times carries more weight than one from a brand-new blog. Tools like Ahrefs measure this with Domain Rating, while Moz uses Domain Authority.
• Relevance — A link from a marketing blog to a marketing tool matters more than a link from a cooking site. Google evaluates topical alignment between the linking page and the linked page.
• Placement — Links embedded naturally within body content are valued higher than sidebar links, footer links, or author bio links.
• Anchor text — The clickable text of the link gives Google context about what the target page is about. Natural anchor text variation is healthy. Over-optimized exact-match anchors look manipulative.

The Link Equity Flow

When Site A links to your page, it passes a portion of its own authority — sometimes called link equity or “link juice” — to your page. That page then distributes some of that equity through its own internal links to other pages on your site.

This is why site architecture matters. A strong backlink to your homepage only helps your inner pages if those pages are well-connected through internal linking.

Types of Backlinks

Type	How It Works	SEO Value
Dofollow	Standard link that passes full link equity	High
Nofollow	Carries rel="nofollow" — a hint not to pass equity	Low-Medium
Sponsored	Carries rel="sponsored" — paid or affiliate placement	Low
UGC	Carries rel="ugc" — from comments or forum posts	Low-Medium
Editorial	Earned naturally because someone valued your content	Highest
Self-created	You placed it yourself (directories, profiles, comments)	Lowest

Editorial backlinks are the gold standard. Everything else is secondary.

Backlinks vs. Internal Links

These get confused constantly. Quick distinction:

	Backlinks	Internal Links
Source	Other websites	Your own website
Purpose	Build authority from outside	Distribute authority within
Control	You can’t control who links to you	Full control
Impact	Domain-level authority	Page-level authority flow

Both matter. Backlinks bring authority into your domain. Internal links channel that authority to the pages that need it most. A strong SEO strategy uses both.

How to Build Backlinks

The most effective link building strategies focus on earning links rather than placing them:

• Create link-worthy content — Original research, data studies, and definitive guides naturally attract references. If your content is the best resource on a topic, people will link to it.
• Digital PR — Pitch data-driven stories and expert commentary to journalists. One link from a news publication can be worth more than 50 directory links.
• Guest posting — Write genuinely valuable articles for sites in your industry. The link is a bonus, not the goal.
• Broken link building — Find broken links on relevant sites and suggest your content as a replacement. Everyone wins — the site owner fixes a dead link, you earn a backlink.
• Resource page outreach — Many sites maintain curated link lists on specific topics. If your content fits, reach out and ask to be included.
• HARO / journalist queries — Respond to journalist requests with expert quotes. When they publish, you get a link from a high-authority publication.

What doesn’t work anymore: buying links, link exchanges, blog comment spam, PBNs. Google’s Penguin update made those tactics risky at best, penalty-worthy at worst.

Best Practices

• Prioritize relevance over raw authority — A DR 40 site in your exact niche often outperforms a DR 80 site in an unrelated industry
• Diversify your link profile — Links from many different domains beat many links from the same domain. Aim for referring domain diversity.
• Monitor your backlink profile regularly — Use Ahrefs, Semrush, or Google Search Console to spot new links, lost links, and potentially toxic links
• Earn links gradually — A sudden spike of 500 backlinks in a week looks unnatural. Consistent, steady growth signals organic link building.
• Don’t ignore internal linking — Every backlink you earn becomes more powerful when your internal linking distributes that equity effectively across your site

Frequently Asked Questions

How many backlinks do I need to rank?

There’s no fixed number. It depends entirely on the competitiveness of your target keyword. A long-tail keyword like “best CRM for veterinary clinics” might need 5-10 quality backlinks. A head term like “CRM software” might need thousands. Focus on quality over quantity — one link from an authoritative, relevant site can outweigh dozens of weak links.

Can backlinks hurt my rankings?

Yes. Spammy, manipulative, or irrelevant backlinks can trigger a manual action from Google. If you discover toxic backlinks pointing to your site, use Google’s Disavow Tool to tell Google to ignore them. That said, Google has gotten much better at simply ignoring bad links rather than penalizing you for them.

How do I check my backlinks?

Google Search Console shows a sample of links pointing to your site under the Links report. For comprehensive analysis, paid tools like Ahrefs (Site Explorer), Semrush (Backlink Analytics), or Moz (Link Explorer) provide full backlink profiles with quality metrics, anchor text data, and new/lost link tracking.

Are nofollow links worthless?

Not entirely. While nofollow links don’t directly pass link equity, Google treats rel="nofollow" as a hint rather than a strict directive. They still drive referral traffic, build brand awareness, and contribute to a natural-looking link profile. A healthy backlink profile has a mix of dofollow and nofollow links.

Sources

• Google Search Central: Link Spam Update
• Google Search Central: How Google Search Works
• Backlinko: We Analyzed 11.8 Million Google Search Results
• Ahrefs: What Are Backlinks and Why They Matter for SEO
• Moz: External Links (Backlinks)