1.

State the difference between Cocoa and Cocoa Touch.

Answer»

Cocoa and Cocoa Touch are two of Apple's widely used application frameworks used for building applications. However, they differ in the following ways:  

CocoaCocoa Touch
It is an application framework for building applications that run on Mac OS X. It is the application framework for building applications that run on DEVICES like iPhones and iPad. 
Frameworks such as Foundation and AppKit are INCORPORATED into Cocoa.  Cocoa Touch is a COMBINATION of Frameworks such as Foundation and UIKit are incorporated into Cocoa Touch. 
Cocoa CLASSES use the NS (used for all classes and constants in the cocoa framework) prefix (like NSTextField, NSWindow). Cocoa Touch classes, on the other hand, use the UI (used for all classes and constants in the cocoa touch framework) prefix (like UITextField and UIWindow). 


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