What does macro export serve?

Development
1

I am developing a VTK module. In the VTK and ParaView examples, and even in the VTK code base, I encounter

#include "<yourModule>Module.h"  // for export macro

I noticed that this header is not in the code base, but is generated. What does it serve? In my experience, the module works fine without it.

2

What does it serve?

It contains export macro for Windows: __declspec | Microsoft Learn

the module works fine without it.

You are problably using linux ?

3

Yes, I am on Linux.