Polycystic Kidney Disease (PKD) is a genetic disorder characterized by the formation of multiple fluid-filled cysts in the kidneys. These cysts can lead to an array of complications, including impaired kidney function and, in severe cases, kidney failure. There are two major forms: Autosomal Dominant Polycystic Kidney Disease (ADPKD) and Autosomal Recessive Polycystic Kidney Disease (ARPKD).