Referral traffic

Referral traffic is made up of visits that arrive by clicking a link on another website — a partner site, a press mention, a backlink, a directory listing — where the referring domain is not classified as a search engine, paid ad, or social network. Analytics tools identify it from the HTTP referrer header sent by the browser.

Referral traffic differs from organic traffic, search engine listings, and from direct traffic, no referrer at all, including many app-embedded links sometimes called dark social. It is closely tied to backlink and partnership work: a spike in referral traffic from a specific domain is often the first sign that a piece of coverage or a new backlink has gone live, before it shows up in a separate backlink index.

The most common data-quality problem with referral traffic is self-referral: visits that bounce between a site's own subdomains, or between the main domain and a checkout or booking subdomain, get logged as referrals from the site itself, inflating the channel and breaking session continuity. Analytics platforms fix this with a "referral exclusion list" for a site's own domains. Practitioners also review referral sources periodically for spam entries — junk domains that generate fake hits purely to appear in referral reports.