A real number can be any number which is a postive number or negitive number. It also inculdes integers, rational numbers, irrational number The symbol to denote a real number is 'R'. even natural number, fractions, decimals come under real number. Real numbers are generally used in computing. Real numbers are also subset of small numbers.
Examples of real number are - 1,2,3,-1,-5,0.3,0.556, 6/7, 9/23 etc.