According to Google the Indexed Web contains at least 4.62 billion web pages. For a business that number can be intimidating when trying leverage the internet to find customers. It is important to understand the difference between SEO, or search engine optimization, and SEM, or search engine marketing before determining how to allocate marketing funds and key business resources. SEO focuses on getting ranked at the top of the list when a user searches for keywords related to your business through organic search results. SEM involves investing advertising dollars into the right keywords to appear in the paid search results on major search engines.