Just like we type any key word on any search engine about which we just want to gather the information. Suppose we just type any key words on Google that will show more than lakhs pages for one key word in just 20 ms.But mostly person gather the information from first page only and close the page. Hardly any person goes to second page or next pages. Honestly speaking no one prefers second or next pages. If we have any website and we want to display our website on Google first page or wants to come in top ten searches or want to carry more traffic on our web site then requires SEO.