Search engine optimization (SEO) is the process of improving the volume or quality of traffic to a web site or a web page (such as a blog) from search engines via “natural” or un-paid (“organic” or “algorithmic”) search results as opposed to other forms of search engine marketing (“SEM“) which may deal with paid inclusion. The theory is that the earlier (or higher) a site appears in the search results list, the more visitors it will receive from the search engine.