Coronary artery bypass grafting is a surgical process of treating coronary artery disease. This surgery is also known as bypass surgery, coronary artery bypass surgery, and heart bypass surgery. Coronary artery disease is a severe condition in which the coronary arteries that supply oxygen-rich blood to the heart get blocked or narrowed. In this surgery, 3 or 4 coronary arteries are bypassed. The surgeon creates a bypass around the blocked or narrowed arteries, thus restoring the normal flow of blood to the heart. Bypassing is done by using a graft, i.e. a healthy blood vessel. Grafts are the blood vessels that are taken from the patient’s veins and arteries located in the arm, leg or chest. The role of the graft is to create a new pathway that carries oxygen-rich blood to the heart. This surgery eases symptoms such as shortness of breath and chest pain. Furthermore, the function of the heart gradually improves, and the risk of dying due to heart diseases is reduced as well. However, the heart diseases that cause the blockages, i.e. coronary artery disease and atherosclerosis are not cured through this procedure.