An Electrocardiogram (ECG or EKG) is a diagnostic test that records the electrical activity of the heart. It provides important insights into heart rhythm, rate, and electrical patterns, helping doctors detect various heart conditions such as arrhythmias, heart attacks, and other cardiovascular diseases. During an ECG, small electrodes are placed on the skin to detect the electrical signals produced by the heart as it beats. The results are displayed as waves on a monitor or paper, allowing healthcare providers to assess heart health and guide treatment decisions effectively.