I recently discovered the true purpose of complex numbers.
They were in a way used to describe rotation or inclination.
i = inclination by 90 degree
i * i = inclination by 180 degrees = -1
i * i * i = inclination by 270 degree = -i
i * i * i * i = inclination by 360 degree = 1
So now lets consider a number like 3 + 4i.
3 is the horizontal component of the number(real part)
4 is the vertical component of the number.(imaginary part)
Hope this would be helpful to someone who stumbles upon.