Referral traffic in Google Analytics can also include your social traffic or even your email visits. This is largely because there are different ways to track data and there are imperfections in the system, but it also depends on which reports you look at. For example, Acquisition> All channels> Referrals will include much of your social traffic, but the default All channels report does not include Social in your Referrals. The best solutions:
The term “organic traffic” is used for referring to the visitors that land on your website as a result of unpaid (“organic”) search results. Organic traffic is the opposite of paid traffic, which defines the visits generated by paid ads. Visitors who are considered organic find your website after using a search engine like Google or Bing, so they are not “referred” by any other website.