Citation:
Integers are whole numbers that can be positive, negative, or zero. They do not have fractional or decimal parts.
Whole numbers are non-negative integers including zero.
$\mathbb{Z}$: $\mathbb{Z}$ represents the set of all integers: $\{...,-3,-2,-1,0,1,2,3,...\}$.
Rational numbers are numbers that can be expressed as the quotient of two integers where the denominator is not zero.