A protoplanetary disk is a rotating disk of gas and dust surrounding a newly formed star. This disk is primarily composed of hydrogen, helium, and other elements, and it plays a crucial role in the formation of planets. As the material in the disk cools and condenses, it can clump together to form larger bodies, eventually leading to the creation of planets, moons, and other celestial objects. The study of protoplanetary disks helps astronomers understand the early stages of planetary system formation. Observations of these disks, often found around young stars like T Tauri stars, provide insights into the processes that lead to the development of systems like our own Solar System.