A number which represents a real whole object is called a natural number.

Natural numbers is a set of numbers which represent real and complete objects. It is mainly used to count the whole objects. Hence, natural numbers are also called as counting numbers.

It is a primary numeric system in real numbers and it starts from number $1$.

Natural numbers are mainly used to count the whole objects.

**Example**

An apple. The number of apple here is one. So, it is called one apple. It is expressed as $1$ apple in mathematics.

**Example**

Cars. The number of cars here in this example is two. Therefore, they are called two cars and expressed as $2$ cars in mathematics.

**Example**

Football. The number of footballs in this case is three. So, they are called three footballs and written as $3$ footballs in mathematics.

**Example**

Puppies. The number of puppies in this example is four. So, they are called four puppies and written as $4$ puppies in mathematics.

The collection of natural numbers forms a set and the set of natural numbers is denoted by a letter $N$ in mathematics. The set of natural numbers are expressed in mathematics as follows.

$N=\{1,2,3,4,\dots \}$

Natural numbers are infinite. So, the set of natural numbers is an example for an infinite set.

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