Referrals reports focus on only referrals traffic from external websites, there are 4 reports available in the Referrals Traffic Section:
The Referrals Overview reports show you the high level information about your website's referral traffic over time.
Referring Sites report don't only show you your referrals traffic but also grouped them by your referring sites, which can be useful when determining value of backlinks.
Referral Landing Pages
Referral Landing Pages report shows you all the referral traffic data grouped by landing pages, you will be able to see which sites have drove traffic to which page on your site.
Referring Pages report shows you every single page that have drove traffic to your website in your defined timeframe.