After checking the official Microsoft documentation Import into an application using __declspec(dllimport) and Exporting from a DLL Using __declspec(dllexport), I still don’t quite understand, so I searched for a lot of information. Below is my understanding. May I ask if my understanding is correct?

• __declspec(dllimport) is used to inform the compiler that this function or class is imported from another file and is not defined in this program.

// There is a function in library libTest called sum.
#include "libTest.h"

__declspec(dllimport) int sum(int a, int b);

int main()
{
    int res = sum(a, b);
    reutnr 0;
}

• __declspec(dllexport) is used to inform the compiler that this function or class is defined in this file and will be used to expose the library for use by other programs.

libTest.h

__declspec(dllexport) int sum(int a, int b)
{
    return a + b;
}