Secure (https) to non-secure sites (http): Since Google began emphasizing the importance of having a secure site, more websites are securely hosted, as indicated by the “https” in their URLs. Per the security protocol, however, any traffic going from a secure site to a non-secure site will not pass referral information. For this issue, you can correct by updating your site to be secure through a third-party SSL certificate.

I'm not in the contest, but if I was - I'd be SKEEEEERED. This was awesome, really - there were MAYBE 3 things I knew... The rest was new. I'm lame that way. The great thing about this is that as a blogger - you've covered ideas I've never thought of...I get my traffic mostly from SEO (not on my blog, but in my websites which are product based review sites) - but there's enough meat in this post I can use for my niche sites to keep me in the black, so to speak (ink I mean, not socks). Awesome post, Brankica - I'm speechless. (If you ignore the foregoing paragraph.)

Referral means people clicked on a link somewhere else. This can be email or social, but is mostly links on other websites. If you switch the view in the Channels pie chart to Sources/Mediums, as we did for the screenshot below, you can see your most important links. For our lab site, Pinterest is major, as are Google’s educators’ sites and several homeschool sites. We can click on Acquisitions> Referrals to see more. Referral traffic can be a little confusing because it overlaps with Email and Social; more on that later.

Direct traffic is defined as visits with no referring website. When a visitor follows a link from one website to another, the site of origin is considered the referrer. These sites can be search engines, social media, blogs, or other websites that have links to other websites. Direct traffic categorizes visits that do not come from a referring URL.