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What is a Referrer? Definition and How Referrer Data Works
A referrer is the source URL or origin that a browser reports when a visitor navigates from one page to another. Analytics tools use referrer data to understand where visitors came from.
For example, if someone clicks a link on a partner blog and lands on your website, the partner blog may appear as the referrer.
Referrer vs referral traffic
Referrer and referral traffic are related, but they are not the same thing:
| Term | Meaning |
|---|---|
| Referrer | The source URL or origin reported by the browser |
| Referral traffic | Visits grouped as coming from links on other websites |
The referrer is the data signal. Referral traffic is the reporting category created from that signal.
Why referrer data can be missing
Referrer data may be missing or reduced because of:
- Browser privacy settings
- Referrer policy headers
- Links from apps or documents
- HTTPS to HTTP transitions
- Redirect chains
- Adblockers
- Search engine privacy changes
- Messaging apps
When referrer data is missing, traffic may appear as direct or unknown.
How to use referrer data
Referrer data helps you find partner sites, review pages, directories, communities, and articles that drive traffic. It can also reveal spam or bot sources that should be filtered.
In Swetrix, referrer reports can be analyzed alongside pages, countries, devices, goals, funnels, and campaign tags. This helps you see which external mentions send valuable visitors, not just visits.
Related terms: referral traffic, direct traffic, traffic channel, and UTM code.
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