BACKLINKS & AUTHORITY
Backlink: what it means and how it works
A link from another site to yours: a discovery path and a reputation signal.
- Beginner level
- 2 primary sources
- Reviewed 29 October 2026
- TopicBacklinks & authorityAlso in SEO fundamentals
- LevelBeginnerNo background needed
- Also calledinbound link, incoming link
- Sources2 primary sourcesGoogle Search Central
- Reviewed29 October 2026Re-checked every 12 months
On this page
Quick definition
A backlink is a link from another website to yours. Search engines treat links as one way to discover pages and as one signal of a page’s importance and reputation, though quality and relevance matter far more than quantity.
Why it matters
Links have been part of how search engines judge pages since PageRank. A link from a relevant, trusted site is evidence that someone found your page worth referencing. Links also send visitors directly, which for local news sites, industry directories and supplier pages can matter as much as rankings.
How backlinks are measured
| Measure | What it counts | Caveat |
|---|---|---|
| Backlinks | Individual linking URLs | One site-wide footer link can create thousands |
| Referring domains | Distinct sites linking | Usually a better measure of breadth |
| Third-party authority scores | A tool’s own model of link strength | Not used by Google; tools disagree |
Every backlink tool crawls only part of the web, so counts differ between tools and none matches what Google knows. Google Search Console‘s Links report shows a sample of links Google has found.
How to evaluate a link
- Is the linking page relevant to your topic or location?
- Would the link exist without SEO? (A supplier listing, press coverage or a partner page: yes. A paid post on a site that links to anything: no.)
- Does the linking page get real traffic and is it indexed?
- Is the link qualified (nofollow, sponsored, ugc) or followed?
Common mistakes and misconceptions
Myth More backlinks always means higher rankings.
In fact A few relevant links from respected sites outweigh many links from irrelevant or low-quality ones.
Myth Domain Authority is a Google metric.
In fact Authority scores are made by SEO tool vendors. Google does not use them.
Myth Buying links is a fast, safe shortcut.
In fact Links bought to manipulate rankings break Google’s spam policies and can lead to manual actions.
Check it on your site
Free tools, no sign-up
- FreeBacklink CSV AnalyzerPaste a backlink export and see referring domains, most-linked pages, follow share, anchors and new links by month.Open the tool
- FreeBacklink Gap ComparatorCompare your referring domains with up to three competitors’ and list the sites that link to them but not to you.Open the tool
- FreeLink Prospect List CleanerTurn a messy list of URLs into clean, deduplicated outreach domains, without your own sites, competitors or big platforms.Open the tool
In the NdovuSEOLabs platform
Run the same checks on every page of your site, with your own data.
Keep learning
Sources and review
- Link best practices for Google Google Search Central
- Spam policies for Google web search Google Search Central
Written and maintained by Ndovu SEO Labs. First published 29 October 2026. Facts last checked against the sources above on 29 October 2026. How we write and review the glossary.