SEO stands for search engine optimization. Simply put, SEO is the calculation of the internal workings of a search engine, thereby allowing a business to utilize these functions. Most search engines sort sites in order of relevance, that is, their relative authority in relation to a search term. SEO allows a business the opportunity to cement its relevance within a given series of search terms. The ramifications of this are obvious: higher-order relevance leads to organic exposure, resulting in higher ranking, more traffic, brand visibility, etc.