Search Engine Optimization (SEO) is finally something of rather abstract. Even if we know how optimizing a website, we could have some questions.

Without really answering all these questions, the statistics can enable us to know which strategy to choose.

I thus advise you to look the table presented below.

The research carried out on the various engines

Other search engines (Lycos, AltaVista, Mozbot etc.) share 5% remainder market. So we can say that Google is the Market Leader and that it is largely the most used engine. It is so popular that some terms have been created to understand the Google phenomenon. We don't search, we “google”.

Now, how the visitors come on our websites? In general (all depends on the sector and the type of website), we can look at this table :

Inbound traffic (source)

Source: XitiMonitor http://www.xitimonitor.com