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A number which can be written in the form
Z = X+ iY ,where X is called a real number and Y is called a complex number.
A complex number  has two parts:

1. Real part: the part of complex number containing real number is called real part.
2. Imaginary part: the part of complex number containing imaginary number is called imaginary part.

    Real numbers has its own properties while complex numbers has its own.
    In real number,there is no gape between any two consecutive real numbers,while in complex gapes may  exist.
    we can say that which number is smaller and which is larger and what is the difference between two real numbers.while in case of complex numbers, we cannot say which complex number is smaller and which is larger and what is the difference between two complex numbers.