referral traffic
Also called: referral visits, referrer traffic
Referral traffic is website visits that arrive when someone clicks a link on another site. In Google Analytics 4 these sessions carry the medium referral and are labeled by the linking domain, for example example.com / referral.
When a browser follows a link from another domain, it can pass a referrer value to the destination. GA4 reads that signal, sets the source to the linking domain and the medium to referral, then files the session under the Referral channel. Google’s own rule for that channel is simply that the medium is one of referral, app, or link, described as non-ad links on other sites or apps such as blogs and news sites.
What counts and what does not
Referral is a catch-all for web links that do not fit a more specific channel. Traffic from Google or Bing is reclassified as Organic Search, and clicks from recognized social platforms become Organic Social, so those never show as referral even though a link was clicked. Visits with no referrer at all (a typed URL, a bookmark, an app open) fall to Direct instead.
Two things distort the numbers. Self-referrals happen when your own domain or a checkout gateway sends users back and gets logged as a referrer; excluding those hosts keeps the data clean. Referral spam is fake traffic from bots that fake a referrer to bait you into visiting their site. Both inflate the channel with visits that never engaged, so treat unfamiliar high-bounce referrers with suspicion before reading them as real interest.
How it affects your traffic
Referral traffic is the visible payoff of your backlink profile: the links that actually send clicks, not just the ones that pass ranking signals. An SEO audit maps which referring domains drive real, engaged sessions, flags dead or toxic links that leak equity, and catches tracking faults (self-referrals, missing UTMs, bot spam) that hide your best sources inside Direct or noise. Cleaning that up shows which partnerships and placements to double down on, so link building targets sites that move people rather than just metrics.
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