What is class prefix in Xcode

Hello
What is class prefix in Xcode ????
do i need to fill this box before publishing my App !!!
if yes what should i write in that box ?
Thanks

The class prefix is a prefix for class files Xcode generates when you create a project or class file. An example of a class prefix is the NS in Cocoa classes. If you enter a class prefix of XYZ and create an Objective-C class called MyClass, the name of the class would be the following:
XYZMyClass
You do not need to fill in a class prefix to publish an app. The main point of using class prefixes is to avoid name conflicts between the classes you write and the classes in external frameworks and libraries.

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