Write a string with binary mode vs text mode [duplicate]

What's the difference with following codes:

Code #1: Using Binary Mode

int main()
{
    std::fstream w("D:\\file.txt", std::ios::out | std::ios::binary);

    char *p = "Hello World\r\nHi";

    w.write(p, strlen(p));

    // Close the file
    w.close();
}

Code #2: Using Text Mode

int main()
{
    std::fstream w("D:\\file.txt", std::ios::out);

    char *p = "Hello World\r\nHi";

    w.write(p, strlen(p));

    // Close the file
    w.close();
}

Does it matter whether I use binary or text mode in case of writing strings like this?