What are Backlinks in SEO?

Byjahurnur@gmail.com

Introduction

If Google were a popularity contest, backlinks would be the votes.

And just like real elections, not every vote counts the same. A vote from someone influential carries far more weight than a vote from a stranger with no credibility.

Understanding backlinks — what they are, how they work, and how to earn good ones — is one of the most important skills in SEO.

What are Backlinks? (Definition)

A backlink is a hyperlink on one website that points to another website. When Site A links to Site B, Site B receives a backlink from Site A.

Backlinks are one of Google’s most important ranking signals. They act as votes of confidence — when reputable websites link to your content, it tells Google that your content is trustworthy, authoritative, and worth surfacing in search results.

Not all backlinks are equal. A backlink from a high-authority, relevant website in your niche is worth far more than hundreds of links from low-quality, unrelated sites. Quality always outweighs quantity in modern SEO.

The Backlink Value Formula

There’s no single formula, but the value of a backlink is influenced by:

Backlink Value = f(Domain Authority of linking site, relevance of linking site, anchor text, do-follow vs no-follow, placement on page)

The key factors:

  • Domain Authority (DA) of the linking site — higher DA = more authority passed
  • Topical relevance — a link from a relevant niche site is worth more than one from an unrelated site
  • Anchor text — the clickable text of the link signals keyword relevance to Google
  • Do-follow vs no-follow — do-follow links pass authority; no-follow links do not (officially)
  • Page placement — links in the main body of content carry more weight than footer or sidebar links

Real Example of Backlinks in SEO

A niche site about running gear publishes a detailed guide: “How to Choose Running Shoes for Flat Feet.” The guide includes original research with podiatrist quotes and a shoe comparison chart.

Three months later:

  • A popular running blog (DA 54) links to the guide in a related article
  • A health and fitness magazine (DA 67) references the guide in a roundup post
  • A running forum includes the link in a thread discussion

These three backlinks from relevant, high-authority sources push the guide from position 14 to position 4 for its target keyword over the following 6–8 weeks. Organic traffic to that page increases from 180 to 1,400 visits per month.

Why Backlinks Matter in SEO

They Are One of Google’s Top Ranking Factors

Google has confirmed that backlinks are among its top three ranking signals alongside content and RankBrain. For competitive keywords, the backlink profile of the top-ranking pages is almost always the primary differentiator.

They Build Domain and Page Authority

Every quality backlink increases both the DA of your domain and the PA of the specific page receiving the link. This compounds over time — more backlinks mean higher authority, which makes future content easier to rank.

They Drive Referral Traffic

Beyond SEO benefits, backlinks from popular sites send direct referral traffic — visitors who click the link and land on your site. This traffic doesn’t depend on Google at all and often includes highly engaged, relevant readers.

Types of Backlinks

Do-follow links pass full SEO authority and are the most valuable for rankings. No-follow links include a tag instructing Google not to pass authority, though they still provide traffic and a natural link profile. Editorial links are earned naturally when other publishers find your content valuable — these are the most powerful. Guest post links come from articles you write for other websites in exchange for a link back. Toxic links come from spam sites, link farms, or paid link schemes and can actively harm your rankings.

Common Backlink Mistakes

Mistake 1: Buying Links in Bulk

Purchasing backlinks from link farms or private blog networks (PBNs) violates Google’s guidelines. Short-term, it might work. Long-term, it risks a manual penalty that can wipe out all your rankings. The risk-reward ratio is poor — especially for a site you’re building for the long term.

Mistake 2: Chasing Quantity Over Quality

100 backlinks from low-DA, irrelevant blogs do less for your rankings than 3 backlinks from high-DA, topically relevant sites. Always prioritise the quality of the linking domain over the total number of links.

Mistake 3: Ignoring Anchor Text Diversity

Using the same exact-match anchor text repeatedly (e.g., always linking with “best running shoes”) is an unnatural pattern Google’s algorithm flags. A healthy backlink profile includes a mix of branded anchors, generic anchors, partial-match anchors, and natural phrase anchors.

Mistake 4: Not Auditing for Toxic Backlinks

Spammy sites sometimes link to you without your knowledge. These toxic backlinks can drag down your site’s authority. Audit your backlink profile every 3–6 months using Ahrefs or Google Search Console and use Google’s Disavow Tool to neutralise clearly harmful links.

Frequently Asked Questions (FAQs)

Q1: How many backlinks do I need to rank on page 1?

There’s no fixed number — it depends entirely on your competitors. Check the backlink profiles of the top 10 pages ranking for your target keyword using Ahrefs or Semrush. Match or slightly exceed the number of quality referring domains of the weakest page in the top 10. That’s your realistic target.

Q2: What is the difference between a do-follow and no-follow backlink?

A do-follow link passes PageRank (SEO authority) from the linking site to yours. A no-follow link contains a rel=”nofollow” tag that instructs Google not to pass authority. No-follow links don’t directly boost rankings, but they still drive referral traffic, build brand awareness, and contribute to a natural-looking link profile. Both have a role.

Q3: How do I earn backlinks without paying for them?

The most sustainable methods are: creating genuinely useful resources others want to cite (tools, calculators, original research, comprehensive guides), writing guest posts for relevant industry blogs, using HARO (Help a Reporter Out) to get quoted in news articles, and creating data-driven content that journalists and bloggers naturally reference. Building backlinks ethically takes time but creates lasting, penalty-proof authority.

Conclusion

Backlinks are the backbone of off-page SEO. They signal trust, transfer authority, and directly influence where your pages rank. Focus on earning them from relevant, high-authority sources through genuinely valuable content — and treat link building as a long-term investment that compounds in value over time, not a quick shortcut to page 1.