**A number set is a collection of numbers that have some common property or characteristic**. There are many different number sets in mathematics, including:

**The natural numbers**: The natural numbers are the counting numbers (1, 2, 3, etc.) that are used to count objects.
**The whole numbers**: The whole numbers are the natural numbers, along with 0.
**The integers**: The integers are the whole numbers, along with their negatives (such as -1, -2, -3, etc.).
**The rational numbers**: The rational numbers are numbers that can be expressed as the ratio of two integers (such as 1/2, 3/4, 5/6, etc.).
**The irrational numbers**: The irrational numbers are numbers that cannot be expressed as a ratio of two integers. Examples include π (pi) and √2 (the square root of 2).
**The real numbers**: The real numbers are all the numbers that can be represented on a number line, including the natural numbers, whole numbers, integers, rational numbers, and irrational numbers.
**The complex numbers**: The complex numbers are numbers that have both a real part and an imaginary part. They are written in the form a + bi, where a is the real part and b is the imaginary part.

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