What is the difference between seo and search engine marketing?

Lol..actually they are both targeted to get sales. The whole point is that SEO optimized sites need to be publicized and no matter ho much SEO you do on customizing the site if it does not reach to the targeted niche market it is a lost cause. I saw PhoenixUP: http://www.phoenixup.com/boost-your-sales-by-being-smart/ , pick up from the virtual dirt sites that were perfectly optimized for SEO and brought down by lack of wisdom in publicizing. The professionals know that it is important to make the sites grow by personal approach .