Cardiology is the branch of medicine that focuses on the study, diagnosis, and treatment of diseases and disorders related to the heart and circulatory system. Cardiologists are medical doctors who specialize in treating heart diseases, and they use various diagnostic tools to evaluate heart function and determine the best course of treatment. They may also perform procedures such as cardiac catheterization, angioplasty, or heart surgery to treat heart conditions. Cardiologists work closely with other healthcare professionals to develop a comprehensive treatment plan for patients with heart conditions.