# Referrer

A referrer is the URL of the page from which a visitor arrived at your website. If someone clicks a link on Twitter and lands on your site, the referrer is Twitter. Direct traffic (typing your URL directly or clicking a bookmark) has no referrer. GhostlyX reads the HTTP Referer header to attribute traffic sources without any personal data.

## Related terms

- [UTM Parameter](/content/glossary/utm-parameter/index.html)  
- [Direct Traffic](/content/glossary/direct-traffic/index.html)  
- [Organic Search](/content/glossary/organic-search/index.html)