### Theory:

Ajay's father asked him to count how many guests arrived at his home then he started counting the guest staring $$1$$, $$2$$, $$3$$, $$4$$, and he finished with the number $$10$$.

Do you know why did he start to count with $$1$$?

Because natural numbers starts from $$1$$.

But what about whole numbers?

We include zero in the whole number system. So all the natural numbers come inside the whole number system.

Therefore we can stay that all the natural numbers are the whole number. But are all the whole numbers are natural number? Think about it.

Now let's see the definition of whole numbers.

Whole number:
The number system which includes all the positive numbers along with zero forms the collection of whole numbers.