Cardiology is a branch of medicine that focuses on the diagnosis, treatment, and prevention of heart and blood vessel conditions. Cardiologists specialize in managing diseases related to the cardiovascular system, including coronary artery disease, heart failure, arrhythmias (irregular heartbeats), heart attacks, high blood pressure (hypertension), and valvular heart diseases. They use various diagnostic tools such as ECGs, echocardiograms, stress tests, and heart catheterizations to assess heart health. Cardiology also includes preventive care to reduce the risk of heart disease, such as lifestyle changes, medications, and interventions like angioplasty or stent placement. Cardiologists work to ensure optimal heart health, providing both medical and interventional treatments to help patients manage and recover from cardiovascular issues.