Registry data refers to a collection of information on a specific population or group of individuals that is systematically recorded and stored in a database or registry. This data is typically collected for the purpose of monitoring and tracking information related to a particular health condition, disease, or treatment. Registry data is often used in medical research to study the natural history of a disease, evaluate the effectiveness of treatments, and identify trends and patterns within a population. By analyzing registry data, researchers can gain valuable insights into the outcomes of different treatments and interventions, inform clinical practice, and improve the overall quality of patient care.