Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in search engines' "natural," or un-paid ("organic" or "algorithmic"), search results.
SEO is process developing a web page that contain all information that is more relevant and easy to understand.It also improving the page rank & visibility of a website in search engines. Basically it has 2 type 1.On page SEO. 2.Off page SEO.