What Are Backlinks?

What Is a Backlink?

Imagine you write an article about the best hiking trails in India. A travel magazine reads it, likes it, and links to your article from their website. That link is a backlink for you. It tells Google that someone else found your content valuable enough to reference.

In HTML, a backlink looks like this:

<a href="https://yoursite.com/hiking-trails">Best Hiking Trails in India</a>

The destination URL (your page) receives the backlink. The page containing the link is called the referring page. Google's original algorithm, PageRank, was built entirely around this concept of links as votes (Google Research, 1998).

Why Backlinks Matter for SEO

Backlinks remain one of the strongest ranking signals in Google's algorithm. A study of 11.8 million search results found that the number-one result in Google has an average of 3.8 times more backlinks than positions two through ten (Backlinko, 2024). Here is why they carry so much weight:

• Authority signal. Each quality backlink tells Google that a real website trusts your content. Pages with backlinks from 40 or more unique domains rank significantly higher than pages with fewer referring domains (Ahrefs, 2025).
• Discovery.Google's crawlers follow links to find new pages. Without backlinks, your content may sit undiscovered for weeks. Google discovers 50% of new pages through external links (Google Search Central, 2024).
• Referral traffic. A well-placed backlink on a popular site can send hundreds of visitors directly to your page, independent of search rankings.
• AI citation. Large language models like ChatGPT and Perplexity use backlink profiles as one indicator of source authority. Pages with strong link profiles are cited 2.4 times more often in AI-generated answers (Semrush, 2025).

The Link as a Vote Analogy

Think of every backlink as a vote in an election. But not all votes are equal:

• A link from a major news site (like Reuters or The Hindu) is like a vote from an industry leader. It carries enormous weight.
• A link from a small personal blog is like a vote from a regular citizen. It still counts, but it carries less authority.
• A link from a spammy directory is like a vote from someone with a criminal record. It can actually hurt your reputation.

Google does not count votes blindly. It evaluates who is voting, how relevant they are to your topic, and whether the vote looks natural or manufactured.

Quality vs. Quantity: What Makes a Good Backlink?

Not all backlinks help your rankings. A good backlink has these characteristics:

• Relevance. A link from a fitness blog to your fitness article is far more valuable than a link from a cooking blog. Google uses topical relevance to weight links (Google Search Quality Guidelines, 2025).
• Authority. Pages on high-authority domains pass more link equity. A link from a domain with DR 80 passes roughly 5 times more equity than a DR 20 domain (Ahrefs, 2024).
• Placement. Links embedded naturally within the body content of a page carry more weight than links buried in the footer or sidebar. In-content links receive 70% more weight in ranking calculations (Moz, 2024).
• Anchor text. The clickable text of the link gives Google context about what your page is about. Natural, descriptive anchor text is best.
• Follow status. A dofollow link passes full link equity. Nofollow, sponsored, and UGC links pass reduced or no direct equity (though they still have indirect value).

How Link Equity Flows

Link equity (sometimes called "link juice") is the authority that passes from one page to another through a hyperlink. Here is how it works:

• Page A links to Page B.Page B receives a portion of Page A's authority.
• The more outbound links Page A has, the less equity each link passes. If Page A links to 100 pages, each link gets a smaller share than if it only linked to 5 pages.
• Equity flows through chains. If Page B then links to Page C, some of the authority Page B received from Page A continues flowing to Page C, though diminished.

A study of 1 billion web pages found that pages receiving link equity from at least 10 unique referring domains had a 96% probability of receiving organic traffic from Google (Ahrefs, 2025). Zero-backlink pages had only a 4.5% chance of receiving any Google traffic.

Your First Backlink Audit

Before building new links, check what you already have. Free tools like Google Search Console show your existing backlinks under the Links report. Ahrefs Webmaster Tools (free for site owners) gives you a more detailed backlink profile. Look for:

• How many unique domains link to you (referring domains)
• Which pages attract the most links (your link magnets)
• Whether any spammy or irrelevant sites are linking to you