Cardiography is the study and recording of the heart's activity, primarily through techniques like electrocardiography (ECG or EKG). This method measures the electrical signals produced by the heart, allowing healthcare professionals to assess heart health, diagnose conditions, and monitor treatment effectiveness. The data collected from cardiography can reveal important information about heart rhythm, size, and overall function. It is commonly used in various medical settings, including hospitals and clinics, to help identify issues such as arrhythmias, heart attacks, and other cardiovascular diseases.