Search Engine Optimization (SEO) is the process of making a web page easily consumable for both other humans and for search engine robots.  Simply put, it is the science of increasing traffic to your website by improving both internal and external factors that influence ranking in the search engine results pages (SERPs).

Proper SEO combines processes, features, additions and ongoing changes to a website in order to achieve top rankings in the major search engines. Google, Yahoo!, MSN, and Ask all look for different ranking criteria. The goal is to make your site friendly to all of these search engines at once.