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A banana. It is not even a number so it is a brilliant non-example.
There is some disagreement as to whether zero, a whole number, belongs to the set of natural numbers.
Natural numbers are the numbers used to count things 1, 2, 3, 4.... Etc. There is some debate if zero should be included with the natural numbers. They are also used to order things first, second, third etc. "The box contains 20 apples" would be an example of natural number usage.
is a natural number a whole number
All natural numbers are also real numbers, but all real numbers are not necessarily natural numbers because natural numbers are positive whole numbers. Real numbers are any number on the number line, which includes irrational numbers like pi and sqrt2. Thus only the positive natural numbers are both natural and real. Hope this is not too long-winded!