Organic search traffic used to just mean the amount of traffic that came to your site via someone who found your site using a search engine. Then, you could drill down into more detail to see which keyword they searched to get to your website. For example, we might learn that someone came to HubSpot.com by searching the keyword phrase "inbound marketing." This is important to know because it helps businesses understand which keywords are driving the most traffic, leads, and customers so they can develop better-informed content and keyword strategies.
The term “organic traffic” is used for referring to the visitors that land on your website as a result of unpaid (“organic”) 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.