A patient registry is a systematic collection of health information about patients who share a specific condition or treatment. These registries help track patient outcomes, monitor disease progression, and evaluate the effectiveness of therapies. They can include data such as demographics, medical history, and treatment responses, which are essential for research and improving patient care. Patient registries are often used in clinical research to identify trends and patterns in diseases like diabetes or cancer. They can also support public health initiatives by providing valuable insights into population health and guiding policy decisions. Overall, they play a crucial role in advancing medical knowledge and improving patient outcomes.