A member of the set of positive whole numbers {1, 2, 3, . . . }, negative whole numbers {-1, -2, -3, . . . }, and zero {0}.
This includes all whole numbers not any fractions or decimals unless those Fractions equal a whole number such as 1 over 1 equal One. or a decimal is a whole number such as 1.0.
Fractions such as 1 over 2 is not an Integer. and a decimal such as 1.1 is not.