You might see referral traffic coming from search engines like Google or Bing, a blog, newsletter, or email or social media sites like Facebook. Referrer traffic could be organic or through a paid search like cost-per-click (CPC) advertising or a paid advertising campaign that you have created (but in many cases, the paid advertising will show up in its very own Paid traffic type).
Before developing this subject further, indulge me to remind you that according to Google a robots.txt file is a file at the root of your site that indicates those parts of your site you don’t want accessed by search engine crawlers. And although there is plenty of documentation on this subject, there are still many ways you can suffer an organic search traffic drop. Below we are going to list two common yet critical mistakes when it comes to robots.txt. 
Armed with this information, ecommerce marketers can learn why some sources might be underperforming or focus efforts on sources that drive better quality traffic. In some cases, this might mean relying less on search engines and more on social media or brand awareness. Other times the opposite could be the best course of action. Either way, the Traffic Sources section in Google Analytics can help.
For a long time, digital marketers summed up the properties of direct and organic traffic pretty similarly and simply. To most, organic traffic consists of visits from search engines, while direct traffic is made up of visits from people entering your company URL into their browser. This explanation, however, is too simplified and leaves most digital marketers short-handed when it comes to completely understanding and gaining insights from web traffic, especially organic and direct sources.
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