What is the difference between real and complex roots?

The difference between real and complex roots:
Real rootsComplex roots
A real root to an equation is a real number.
A complex root is a fictitious root that is represented by complex numbers in an equation.
For example: The real roots of an equation $x^2+3x-4=0$ are:
$x=-4$ or $x=1$
For example: The complex roots of an equation $x^2-4x+8=0$ are:
$x=2+2i$ or $x=2-2i$
complex roots are always occur in pair for real polynomial.
Thus,the difference is clearly explained.