What is SEO?
When you enter a search query in a search engine there is a set of results that are displayed. Users usually click on the top most ones considering them the most relevant.
Search Engine Optimization (SEO) is an online marketing strategy to lead quality traffic to a website and associated pages. It is the art of modifying a website in order to increase its ranking in organic (vs. paid), crawler-based listings of search engines.
Organic SEO is the process by which you optimize your website according to the recommendations of any search engine like Google, Yahoo and Bing, to achieve targeted traffic to the websites without resorting to paid campaigns through third party services.