Organic traffic is traffic that coming from a search engine, such as Google or Bing of unpaid 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.

The "Organic traffic" is traffic that comes to your website as a result of unpaid search results. (See: What is the meaning of an "organic search" on the Internet?) Frequently, one of the goals of SEO is to increase organic traffic. Other types of traffic include: Pay Per Click (PPC) - traffic from ads that cost money.

Organic means natural traffic of website. This is unpaid service.