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This is most likely a stupid question but....

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Dwarvindeath
#1 - April 14, 2011, 9:29 p.m.
Blizzard Post
What does API stand for?
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Straton
Web & Mobile Team
#2 - April 14, 2011, 9:36 p.m.
Blizzard Post
Application Programming Interface

Wikipedia has a lot of relevant information: http://en.wikipedia.org/wiki/Application_programming_interface#Web_APIs