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What Is a Backlink? A Plain-English Definition

What is a backlink? A plain-English definition, a real example, the backlink types that count, and why mentions now matter more for AI search.

By Mehdi Hassan4 min read

The short answer

A backlink is a link on another website that points to a page on your website. Search engines read backlinks as votes of confidence: a link from a relevant, trusted site tells Google your page is worth showing. Backlinks are also called inbound links, and quality matters far more than count.

Key takeaways

  • A backlink is a link from someone else's site to yours, also called an inbound link.
  • One relevant link from a trusted site beats dozens of links from unrelated directories.
  • Ahrefs found brand mentions correlate 0.664 with AI Overview visibility, backlinks only 0.218.
  • Earn links with things worth citing: original data, real prices, clear comparisons and tools.

Part of Web Design, SEO and AEO Glossary: 50 Terms Explained Simply

A backlink is a clickable link on a page you don't own that sends readers to a page you do own. If a software review site links to your pricing page, that's a backlink to your pricing page. From the other site's point of view, the same link is an outbound link.

The term matters because links are one of the oldest signals search engines use to judge which pages deserve attention. It sits alongside Domain Authority and entity SEO in our SEO and AEO glossary.

Take a marketplace profile as an example. When a profile like ours on Contra, where we hold a 4.92 rating across 11 reviews, links to designify.design, that link is a backlink: a third-party platform pointing to our domain and confirming the studio behind the profile exists.

Backlinks matter because they help search engines discover your pages and judge how much other people trust them. Google follows links to find new URLs, and a page that many relevant sites cite is more likely to rank than an identical page nobody references.

Not every link carries the same weight. A link from an industry publication that writes about your category counts for much more than a link from a directory that lists every site on the internet. The anchor text, the words that are linked, also tells Google what your page is about.

Link type

What it signals

Worth chasing?

Editorial link in an article

A writer chose to cite you

Yes, the most valuable kind

Review or listing platform

You're a real, listed business

Yes, for the core platforms in your category

Partner or integration page

A working relationship

Yes, and it's often easy to ask for

Paid or swapped links

Nothing Google trusts

No, it breaks Google's spam policies

Mass directories and comment links

Very little

No

Backlinks still matter, but they correlate less with AI visibility than plain brand mentions do. In Ahrefs' study of 75,000 brands, web mentions correlated 0.664 with visibility in Google's AI Overviews, against 0.218 for backlinks and 0.326 for Domain Rating.

The practical reading: AI systems seem to care whether the web talks about you, linked or not. A podcast transcript, a Reddit thread or a newsletter that names your product can help even with no link attached. Links remain useful for classic rankings, which still feed AI Overviews, so treat links and mentions as two sides of the same work. The comparison of SEO, AEO and GEO explains where each one fits.

You earn backlinks by publishing something other people need to reference. In B2B, that usually means original numbers, honest price ranges, useful comparison tables or a free tool.

  • Publish real prices and comparisons. Writers link to the page that gives the specific answer. Our guide to comparison tables shows the format that gets quoted.
  • Claim the platforms in your category. Review sites, marketplaces and integration directories all link to the businesses they list.
  • Ask partners. Integrations, agencies you work with and investors' portfolio pages are links you can simply request.
  • Give your authors a home. A named expert with an author page gets invited to podcasts and quoted in articles, and both create links and mentions.
Hypothetical example: protecting backlinks during a redesign

For example, suppose a SaaS company has 40 sites linking to its old /pricing-plans URL. The new site moves pricing to /pricing and nobody adds a redirect. Every one of those backlinks now lands on a 404 page, and the credit they passed is lost.

A single 301 redirect from the old URL to the new one keeps that value. This is why a website migration SEO checklist always starts by exporting the pages with the most backlinks.

Frequently asked questions

What is the difference between a backlink and an internal link?
A backlink comes from a different website to yours. An internal link connects two pages on the same website, such as a blog post linking to your pricing page. Both help search engines understand your site, but only backlinks show that outside sources vouch for you. Internal links are fully under your control, so they're the faster fix.
How many backlinks do I need to rank?
There's no fixed number. It depends on how competitive the query is and how strong the pages already ranking are. A page answering a niche B2B question can rank with a handful of relevant links, while a broad commercial term may need many. Compare yourself with the pages on the current results page rather than chasing a target count.
What is a nofollow backlink?
A nofollow backlink carries a rel="nofollow" attribute, which tells search engines the site isn't vouching for the destination. Google treats nofollow, sponsored and ugc attributes as hints rather than strict rules. These links still send visitors and still create brand mentions, so a nofollow link from a relevant, busy page is worth having.
Can bad backlinks hurt my site?
Google says it ignores most spammy links rather than penalizing the site they point to. The real risk comes from links you built or paid for in a pattern that looks manipulative, which can lead to a manual action. If you've never bought links, random low-quality links pointing at you are usually nothing to worry about.

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