As you can see, I deliberatedly used the name pointer_to_number to express the fact that this location in memory is actually a pointer. It is a pointer to number_1 because it holds its address.
Imagine we add another number, let’s call it number_2 and want pointer_to_number to be able to point to number_2, this is, contain the address of number_2 as well. Let’s make a first attempt.