 Dielectric loss EM wave absorbing materials have become increasingly important in modern society due to their multifunctionality in military stealth and incoming 5G smart era. Research has focused primarily on material synthesis rather than in-death mechanism studies which can lead to misconceptions and ambiguities regarding the various mechanisms involved. This paper provides a comprehensive overview of these mechanisms as well as novel approaches to controlling them. It also highlights the importance of understanding the underlying physics behind the material's performance and how this knowledge can be used to develop better materials with improved performance. This article was authored by Mingqin, Li Mingzhang, and Hongjing Wu.