Protostellar disks are flat, rotating structures of gas and dust that surround young, forming stars. These disks play a crucial role in the formation of planetary systems, as they provide the material from which planets and other celestial bodies can accrete. In addition, protostellar disks are also believed to be the sites where complex chemical processes take place, leading to the formation of organic molecules and potentially the building blocks of life. Researchers study protostellar disks using a variety of observational techniques, including infrared and radio telescopes, as well as theoretical models and simulations. By studying the properties and behavior of protostellar disks, scientists can gain insights into the processes that govern the formation and evolution of stars and planets. This research area is important for understanding the origins of our own solar system and the potential for habitable planets to exist in other star systems.