Counting/Natural Numbers:
1, 2, 3, 4, 5...
Whole Numbers:
0, 1, 2, 3, 4, 5...
Integers
...-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5...
"Rational", or fractional, numbers, are technically regarded as ratios (divisions) of integers. In other words, a fraction is formed by dividing one integer by another integer.