Organic Traffic
Organic traffic is defined as what a site gets only through organic search. This means that users found the website by searching for a keyword or phrase in the search engines and clicked on the link offered in the search results.
Organic traffic is therefore free and potentially available to all sites, but its actual value depends on many variables, including actual position in SERPs, structural features of the SERP itself, level of optimization and attractiveness of preview snippets, and so on.