What field is used in the identity inspector?

Question

What is the module field in the identifier used? In Xcode, when you switch to the identity inspector, there is a field under the class name. I understand that the class field is for class selection, but not too sure what the module field is. You can see the screenshot below.

Answer 1

This is taken from the 2014 WWDC discussion

Now you can notice the new module field here.

Another great way Swift enhances the coding experience is by associating classes with the modules in which they are declared.

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