Here is the link to Google APIs: https://developers.google.com/
What are Google APIs: http://www.rankforsales.com/google-api-s-and-their-uses.html
“The Google API stands for ‘Application Programmable Interface’. As it’s name implies, it is an interface that queries the Google database to help programmers in the development of their applications….By definition, Google API’s consist basically of specialized Web services and programs and specialized scripts that enable Internet application developers to better find and process information on the Web. In essence, Google APIs can be used as an added resource in their applications.”
Some examples: http://mashable.com/2007/08/09/google-apis/
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