 Biomast-derived porous carbon, PC, materials have been shown to be effective for electromagnetic EM wave absorption due to their unique characteristics, including large surface area, low density and high dielectric loss. These properties make them ideal candidates for use in EM wave absorbing applications. Recent research has focused on optimizing the structure and composition of these materials to further enhance their performance. Additionally, the use of biomass-derived PC materials in the development of novel microwave absorbers is also being explored. This review provides an overview of the current state of research into the EM wave absorption capabilities of biomass-derived PC materials, discusses the synthesis methods used to produce them, and outlines future directions for the development of these materials. This article was authored by Huanqin Zhao, Yan Cheng, Wei Lu, and others.