# Source: https://gitbook.com/docs/help-center/published-documentation/site-insights/what-does-not-set-means-in-referrer-insights.md

# What does "Not set" means in referrer insights?

When reviewing your GitBook analytics, "not set" referrers indicate **direct traffic**. This means visitors typed your URL directly, used a bookmark, or clicked links from emails and apps that don't pass referrer data.