C++'ta string nasıl karakterlere ayrılır?

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#include <iostream>
#include <string>
#include <cstring>
using namespace std;

int main() {
    string msg = "test message";
    
    for(auto chr: msg) {
        cout << chr << endl;
    }
    
    char arr[25];
    std::strcpy(arr, msg.c_str());
    cout << "arr: " << arr << endl;
    
    
    for(int i=0; i< msg.size(); ++i) {
        cout << msg[i] << endl;
    }
    return 0;
}