A Heart-Lung Machine is a medical device used during certain types of surgeries, particularly those involving the heart. It takes over the functions of the heart and lungs, allowing surgeons to operate on a still and bloodless heart. The machine pumps oxygen-rich blood to the body and removes carbon dioxide, ensuring that vital organs continue to receive the necessary blood supply. This machine is crucial in procedures like coronary artery bypass grafting and heart valve repair. By maintaining circulation and oxygenation, the Heart-Lung Machine enables complex surgeries to be performed safely, significantly improving patient outcomes.