Organic traffic is visits that came from a search engine, but are not paid for. Someone went to a search engine like Google, typed in a keyword and your site came up as one of the unpaid results and they clicked on it. Referral traffic is visits that came via a link from another website.
Organic traffic are those which are coming from search engines when the user searches.But the referral traffic means by advertising the site, etc.This is the inorganic traffic.
Organic traffic is coming from search engines, directories and others. Referal traffic is advertising, link building and others.
Organic traffic means search from Google, Yahoo and Bing search engine traffic and referrals is the links that lead to your website
Organic results are the left panel results. Referrals are like many have said on here, traffic coming from other websites directly linking to yours. Keep in mind organic traffic is about 70% of online traffic, although your conversion rate may vary.