Matt cutts google, the basic primer
There are many Search Engine Optimization companies around. However, if you were to ask several people what Search engine optimization is (SEO); you would probably receive many different answers. Search Engine Optimization can be described as the amount traffic driven in from a search engine. Expert SEO services optimize the web sites so that they can get better results from search engines rather than trick them. It comes down to understanding the elements that on the page that search engines look for when it searches web pages.