A ventricular assist device (VAD) is a mechanical pump used to support heart function in patients with severe heart failure. It helps the heart pump blood more effectively, either as a temporary solution while waiting for a heart transplant or as a long-term treatment for those who are not candidates for surgery. VADs are typically implanted in the chest and connected to the heart's ventricles. They can significantly improve the quality of life for patients by reducing symptoms like fatigue and shortness of breath, allowing them to engage in daily activities more easily.