Question

what do you mean by a pointer to a pointer? Can this be extended?

Answer 1

A pointer variable can be assigned the address of an ordinary variable.

Now, this variable itself could be another pointer.

This means that a pointer can contain the address of another pointer.

Explanation:

A pointer to a pointer is a form of multiple indirections, or a chain of pointers.

Normally, a pointer contains the address of a variable.

When we define a pointer to a pointer, the first pointer contains the address of the second pointer that points to the location that contains the actual value.

A variable that is a pointer to a pointer must be declared as such.

This is done by placing an additional asterisk in front of its name.