Angiography (angio) is a general medical method used for imaging blood vessels. Coronary angiography, on the other hand, is a specialized subset of this general method, applied specifically to evaluate the condition of the coronary arteries that supply the heart. Both terms generally refer to minimally invasive procedures; a catheter (a thin tube) is typically advanced to the heart via a blood vessel, usually in the arm or groin. Through this catheter, a special contrast agent is injected, allowing detailed and clear images of the coronary arteries to be obtained. In summary, coronary angiography is a type of angiography specifically focused on examining the heart's blood vessels.