Cardiology is a branch of medicine focused on diagnosing and treating conditions related to the heart and blood vessels. It encompasses a wide range of disorders, from congenital heart defects and coronary artery disease to heart failure and arrhythmias. Cardiologists use various diagnostic tools, such as ECGs, echocardiograms, and stress tests, and may employ treatments ranging from lifestyle changes and medications to more advanced procedures like angioplasty and heart surgery.