What is referral traffic?

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Referral traffic is the segment of traffic that arrives on your website through another source, like through a link on another domain. Analytics automatically recognizes where traffic was immediately before arriving on your site and displays the domain names of these sites as the referral traffic sources in your reports.
In theory, referral traffic shows visitors who came from other websites. But in practice, it often includes traffic driven from social media efforts, email and in some cases, traffic from one page on your site to another.