Cardiology is the branch of medicine that deals with the study, diagnosis, and treatment of disorders related to the heart and circulatory system. Cardiologists, specialized doctors in this field, focus on conditions such as heart disease, heart failure, arrhythmias, and coronary artery disease. Diagnostic tools include electrocardiograms (ECGs or EKGs), echocardiograms, and cardiac catheterization. Prevention through lifestyle changes and medical management plays a key role in maintaining heart health.