Google Inc. maintains an index of Websites and other online content, and makes this information freely available through its search engine to anyone with an Internet connection. The Company’s automated search technology helps people obtain nearly instant access to relevant information from its online index. The Company generates revenue primarily by delivering online advertising. Businesses use its AdWords program to promote their products and services with targeted advertising. In addition, the thousands of third-party Websites that comprise the Google Network use its AdSense program to deliver relevant ads that generate revenue and enhance the user experience. In September 2009, the Company acquired ReCAPTCHA Inc., a spin-off of Carnegie Mellon University's Computer Science Department. In February 2010, the Company acquired Aardvark. In February 2010, the Company acquired On2 Technologies, Inc.