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What Is Referral Traffic in Google Analytics?
Referral traffic is the segment of traffic that arrives on your website through another source, like through a link on another domain.
A referral in Google Analytics happens when one website refers traffic to you—resulting in a new user clicking through to your website. Essentially, it's a recommendation from one site to another.
Referral traffic describes the people who come to your domain from other sites, without searching for you on Google.
Referral traffic is Google's method of reporting visits that came to your site from sources outside of its search engine.