int main() {
char *bar = 0;
foo(&bar); // bar contains "Hello World" after this
free(bar);
return 0;
}
And indeed, it might get used for lists to pointers and such. An easy example is for example your arguments coming into main(); can be "char * argv[]" or "char ** argv"
Simply, it allows you to change (modify) the pointer that is passed to you. It's usually used when a function allocates some memory within itself and then it passes it back to you, instead of you allocating a buffer and passing it to the function.
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