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** is a pointer to a void*. A void* can be converted back and forth to any pointer type (including void**). So you can do:

char* -> void*
void* -> void**
void** -> void*
void* -> char*

You can not do:

char* -> void**
void** -> char*

so they are not the same.