Integers are whole numbers and negative numbers without fractions or decimal parts. The following are some examples of integers and non-integers.

Integers	Non-integers
$17,$ $0,$ $\text{-}1,$ $121,$ $\text{-}67$	$\pi ,$ $\text{-}\frac{3}{4},$ $1.5,$ $\text{-}12.9,$ $\frac{1}{2}$

An integer can be positive, negative or zero. The set of all integers is denoted by $\mathbb{Z}.$

The dots indicate that the set continues to increase or decrease by one unit at a time indefinitely. An example of the use of integers is to represent temperatures below zero. One of the lowest temperatures recorded on earth was about $\text{-}89^{\circ }C.$