- An integer is a number that can represented without a decimal or fraction part
- An integer could be negative, positive, or 0
- Set Notation: \Zeta =\left\{ ...,-5,-4,-3,-2,-1,0,1,2,3,4,5,... \right\}
- As indicated by the ellipses (…), there are an infinite number of integers
- An integer is a rational number