Cardiovascular disease is a general term that describes a disease of the heart or blood vessels. There are four types of cardiovascular disease. They are coronary heart disease, stroke, peripheral arterial disease, aortic disease. Cardiology is a branch of medicine dealing with disorders of the heart is it human or animal. it deals with every aspect related to heart. Various hearts related diseases can be diagnosed as well as treated by certain techniques. Also it refers to the mechanism of blood flow in the body.