Referral traffic is Google's strategy for detailing visits that went to your site from sources outside of its web crawler. When somebody taps on a hyperlink to go to another page on an alternate site, Analytics tracks the snap as a referral visit to the second site. The starting site is known as a "referrer" in light of the fact that it alludes activity starting with one place then onto the next. Referral activity is one of three insights followed by Google Analytics.