What Are Backlinks and Why They Matter

Link equity, the PageRank concept, and why backlinks remain the strongest off-page ranking signal.

The PageRank Concept: A Link is a Vote

Google's founders began with a simple insight: a link from one page to another is a vote of confidence. If person A links to person B's work, they are implicitly saying "this is valuable". Scale that across the entire web, and the sites that accumulate the most votes deserve to rank highest.

This core idea, PageRank, remains central to how Google assesses authority 25+ years later. The algorithm has evolved dramatically — it now considers hundreds of signals — but the fundamental signal of "who links to you?" remains one of the strongest. A comprehensive study by Semrush found links were among the top 3 most correlated factors with rankings in competitive niches.

Why This Matters

Links remain the primary way to transfer authority across the web. Without them, even excellent content will struggle to rank in competitive spaces. This is not opinion — it is reflected in how Google itself uses links to crawl and understand the web.

How Link Equity Flows

Not all links are equal. A link from TechCrunch to your article passes far more authority than a link from a 3-month-old blog. Why? Because TechCrunch itself has accumulated significant link authority from across the web, and when it links to your page, some of that authority flows to you.

This concept is called link equity, or link juice. Here is how it works in practice:

A high-authority domain linking to you transfers more equity. A site with significant link authority passes more value when it links to your pages.
The position of the link on the page matters. A link in the main content of an article is more valuable than a link buried in a footer or sidebar.
The anchor text (clickable link text) signals relevance. A link with anchor text "best SEO practices" tells Google your page is about SEO practices more than a generic "click here" link does.
The linking page itself matters. A link from a highly relevant page (one about SEO) carries more weight than the same link from an unrelated page.

Not All Links Are Equal

Google recognises four types of links, each with different characteristics:

Dofollow links pass authority. This is the default. The linked page benefits from the authority of the linking domain.
Nofollow links do not pass authority but may still drive traffic and provide ranking signals indirectly. Google says it treats them as hints, not absolute instructions.
Sponsored links (marked with rel="sponsored") indicate paid partnerships. They should not pass ranking value, though Google may use them for discovery.
User-generated content links (marked with rel="ugc") are links in comments, forums, or social platforms. Useful for discovery, not for passing authority.

The key principle: if a link is paid or editorial in nature (like sponsorships), mark it appropriately. Google's systems are sophisticated enough to detect patterns of manipulative linking anyway — transparency is easier and safer.

The Decline That Never Happened

For the past decade, voices in the SEO industry have declared links dead. Each algorithm update sparked think-pieces about how links no longer matter. Yet Google continues to release algorithm updates focused on link quality (Penguin was all about bad links, Helpful Content updates often penalise low-authority sites with few links).

The reality: links remain among the strongest ranking signals, but the web has also matured. In 2005, links were practically the only signal of quality. Today, Google uses hundreds of signals — freshness, user engagement, entity recognition, topical authority, and more. Links matter less as a percentage of the ranking equation, but they remain essential. A page with no links will rarely rank for competitive terms, no matter how excellent its content.

Common Misconception

"We don't need links anymore; content is king." False. Excellent content without links remains mostly invisible. You need both. The content must exist (to have something worth linking to), and links must follow (to signal that the content deserves to rank).

What Constitutes a Quality Link Today

Google has confirmed through updates like Helpful Content that it distinguishes between links that indicate genuine endorsement and links that indicate commercial pressure or manipulation. A quality link today typically has these characteristics:

It comes from a topically relevant website (a finance site linking to financial advice matters more than a random blog)
The linking page has high editorial standards and few outbound links (suggesting links are given carefully)
The anchor text is natural — neither over-optimised nor generic
The link sits in the main content, not in navigation or boilerplate
The link is editorially earned, not purchased or part of a reciprocal arrangement

The inverse is also true: links from link farms, PBNs (private blog networks), auto-approval directories, and massive reciprocal linking schemes are increasingly discounted or ignored by Google's systems. This shift has made link building harder but more honest.

Practical Implications

For your site, this means:

Link building should focus on quality over quantity. Ten links from relevant, high-authority domains are worth far more than 1,000 links from low-quality sources.
Earned links (content people genuinely want to cite) are the long-term play. They are harder to build but stable.
Anchor text should be natural. Use your main keyword occasionally in anchor text, but let most links use your brand, generic text, or page title.
Domain age and topical authority matter. A link from an established site in your industry carries more weight than a link from a new, unrelated site.

Practical Next Step

Analyse the backlink profiles of your top 3 ranking competitors for your target keywords. Use Ahrefs or Semrush to identify where they get links from. What types of content earned them those links? What link-worthy assets do you lack? This comparison will reveal realistic link-building opportunities for your niche.

How This Connects

Links do not exist in isolation. The sites that rank best typically have strong links, strong content, strong domain authority, and strong user engagement. The next pages in this section drill deeper into domain authority, link-building strategies, and how to assess link quality. But remember: every link starts with content worth linking to. Your content strategy directly determines how many links you will eventually earn.