What is the Meaning & Definition of natural numbers

It is called as a natural number to that number, enabling you to count the elements in a set. 1, 2, 3, 4, 5, 6, 7, 8... are natural numbers.
It should be noted that these were the first set of numbers that used human beings for counting objects.
This type of number is unlimited, i.e. whenever join you the number one will give way to a different number.
Two large jobs of the natural numbers are, on the one hand, to indicate the size which presents a finite set, and on the other hand, to account for the position that a given element has within the framework of an orderly sequence.
Also, the natural, at the behest of a group numbers, allow us to identify either differentiate those elements present in the same. For example, in a social work, each affiliate will have a number of partner which melodies to other and which will not be confused with another and have direct access to all the inherent to your attention details.
There are those who consider the 0 as a natural number but there are also those who do not and they turn away from this group, sets theory supports it while excludes it the theory of numbers.
To natural numbers can represent them in a straight line and will order from least to greatest, for example, if it is taken into account to zero, will start them is scoring after and to the right of 0 or 1.
But the natural numbers belong to a set that brings together them, the positive integers and this is because they are not decimal or fractional.
However, with respect to the basic arithmetic operations, addition, subtraction, division and multiplication is important to point out that the numbers that we are dealing with is a gated community for the operations of addition and multiplication, given that operating with them, the result that always will be other natural number. For example: 3 x 4 = 12 / 20 + 13 = 33.
Meanwhile, this same situation does not apply to the other two operations of division and subtraction, since the result will not be a natural number, for example: 7-20 = - 13 / 4/7 = 0.57.