Thread: about multiple file programming.

Code:

// Main.cpp

#include<iostream>
#include"greet.h"
using namespace std;

int main()
{
greetings();
return 0;
}

Code:

// Greet.h
void greetings();

Code:

//Greet.cpp
#include "greet.h"
void greetings()
{
cout<<"hello world";
}

How is greet.cpp is included in main.cpp?
I think #include "greet.h" will include the code from greet.h file to main.cpp and greet.cpp.
But there is no statement to include greet.cpp in main.cpp.
Then why greet.cpp is accessible from main.cpp?