Hello. I have been in contact with some papers that use DFT softwares for calculating properties of solids, nanoparticles, etc and a lot of them comes with colorfull plots of density of states. I know the density of states gives the number of electrons in the range of energy, but what I don't know is what is the importance of the plots they usually present in these papers. They don't do a very detailed analysis of these plots so I wonder what are they used for and why separate the contributions of each atom/orbital to the DOS. Thanks.