SEO or Search Engine Optimizer The people responsible for the development of your web page. They increase the traffic of your site through article and directory submission-submitting your link to different related sites. Over all they are your backup for your sites updates and popularity.
If you are a prof SEO, then you can offer your services and make money. If you implement some of the good techniques then, you get a lot of traffic, which you can convert into money, as you might know the golder formula : Targeted Traffic + Great offer = $$$$ A good book for your reference : http://www.seobook.com/ -- not aff link ~G