What is real number please explain

The number which square is always positive called real number .
They are either irrational or rational numbers. The rational numbers include both positive and negative numbers, zero and fractions. 
Examples: 0, 1,2,3,...(positive numbers), -1,-2,-3,....(negative numbers), 1/2, 7/3, 5/6,....(fractions), √67, 1+√3, 7-√3,....(irrational numbers).

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A number which included rational or irrational number is called real number
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