Google celebrated its 13th birthday on September 27th. The company was founded by Larry Page and Sergey Brin as a search engine that used PageRank, an algorithm that determines search result rankings based on how many times terms appear on a webpage. Google has since expanded well beyond search to include applications like Gmail, Google Video, Google Images, and Google Maps. Google is now a global company so prevalent that the word "google" has become a verb defined as searching for something online in the Oxford Dictionary.