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Use & Purpose of API ???
Carl Sergile16,570 Points
The meaning of API is no different in iOS than any other environment. It's a generic term referring to the published means by which one can access or use a resource in a computer program...
Hope that helps!
Application Programming Interface (API) is an interface between two separate software system talking to each other. Find more on http://www.guru99.com/api-testing.html for basic understanding in a simple way.