What's the difference between void* and void**?

Question

It\'s the special property that void* can also be assigned a pointer to a pointer and cast back and the original value is received.

I read this line

Answer 1

A void * can hold any pointer. Since there are no actual void objects, a void * is always a pointer to some other type.

A void ** is a pointer to a pointer to void, or the address of a void *, i.e., the address of a pointer to void. This is an actual type and doesn't have any magic properties.

But since a void * can hold any pointer, it can also hold, for example, a void **.

void **f(int x) {
   static void *y;
   static int *iy;
   y = &x;
   iy = &x;
   // return &iy; // not ok
   return &y; // ok
}