The Seo expertise is a skill that is acquired on the basis of the study of the behavior of the Serp. An Seo expert is the person who deals with indexing the major search engines (Google, YouTube, Bing, and Yahoo) of Web content, taking care of a technical skill that allows a website to be indexed correctly and quickly. An Seo expert should be able to achieve an organic local, national and international indexing, and in compliance with search engine policies in order to avoid penalties.