Search engine optimization referred as SEO in simple word is increasing presence of a website or a blog on the internet thus increasing volume of traffic to a website or blog from search engines by natural means or unpaid search results. This can be done by optimizing your website and website keywords in a such a way that they appear on the top of natural search results whenever the keyword is searched .About 80% of the traffic to a website comes from search engines so it is very necessary that your website or blog appears on first 10 to 30 search results and secondly the traffic from search engines is totally free. Traffic and volume of traffic to a website and blog determine the success of a website or blog.