As I mentioned earlier, one of the biggest downsides to SEO is that Google is constantly making changes to their algorithm; they come out of nowhere, and they can drop your domain authority by 5, 10, even 15 points and it almost feels like you need to start optimizing all over again. It's frustrating, it's hard work and the results aren't always visible - but if you can get SEO right, it can truly be an amazing source of traffic.
Traffic from organic search is free and long-lasting, which makes you less dependent on advertising budgets. If you look at the list of the top three American e-commerce retailers, you will find that it matches the above data with the top three companies getting the most organic traffic. This definitely proves that SEO pays off in the long run: you attract quality traffic in large volumes without paying for it directly.
To sum up all of this information, even organic traffic, like direct traffic, has some gray areas. For the most part, though, organic traffic is driven by SEO. The better you are ranking for competitive keywords, the more organic traffic will result. Websites that consistently create content optimized for search will see a steady increase in organic search traffic and improved positioning in the search results. As a marketer, it is important to look at your keywords and high-ranking pages to identify new SEO opportunities each month.  
So I figured it's high time to break down what all those sources actually mean . Now, depending on what software you're using to measure all of these things, they may be bucketed slightly differently, but these definitions are pretty common across most tools you'll encounter. Make sure to double check on the finer points of some of them, but this should be a good starting point for you if you're new to this whole marketing measurement and analysis "thing."
Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources:
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