A number which has no decimal or fractional part.
The "natural" or "counting" numbers are the ones familiar to everyone: 1, 2, 3, 4, 5, ... etc.
The "whole numbers" are the same as natural numbers but also include zero: 0, 1, 2, 3, 4, 5, ... etc.
The "integers" are the same as natural numbers but also include zero and all the negative numbers: ... -3, -2, -1, 0, 1, 2, 3, ... etc; represented in mathematical work as Z.
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