Disk masses refer to the total amount of matter present in the disks surrounding young stars. These disks are composed of gas, dust, and planetary building blocks, and play a crucial role in the formation of planets. Studying disk masses can provide insight into the processes of planet formation, the evolution of protoplanetary disks, and the overall dynamics of young star systems. Researchers use a variety of techniques, such as infrared and submillimeter observations, to measure disk masses and further our understanding of the formation and evolution of planetary systems.