Online Testing Essentials: "A well-built sales funnel is never complete until every part of it has been tested and optimized. For maximum success, marketers should dig deep and experiment with every customer interaction point.
As you know, search engines are responsible for a lot of your website traffic. The more search engine friendly a website is, the more chance people using a search engine will take place. Basically by making your site SEO, you are increasing your traffic.