Emission spectrum
Following the absorption of primary radiation some materials give out secondary radiation, e.g. fluorescence and phosphorescence.
The spectrum obtained in such a situation is called an emission spectrum.
Emission spectrum of Cadmium
Absorption spectrum
A spectrum obtained by analysing the radiation after its passage through an absorbing medium, e.g. microwave, IR, and UV / Visible spectra.
Absorption spectrum of Iodine