  In this overview paper, we investigate the dispersion of electromagnetic
waves for dissipative and non-dissipative dielectric-magnetic uniaxial mediums.
Changing the sign of one component of dielectric permittivity ({\epsilon}) or
magnetic permeability ({\mu}) from positive to negative will lead to sixteen
different cases (real or imaginary) for a non-dissipative medium and eight
different cases for dissipative one. In a non-dissipative medium, dispersion
relations follow the elliptic/hyperbolic relations. This rule completely
vanishes regarding the dissipative medium. While the number of dispersion cases
in a dissipative medium is lower than a non-dissipative one, there are cases
which are not allowed in non-dissipative mediums but allowed in dissipative
mediums.
