An electrocardiogram (EKG or ECG) is a medical test that records the electrical activity of the heart over a period of time. It uses small electrodes placed on the skin to detect electrical signals produced by heartbeats. The resulting graph shows the heart's rhythm, rate, and any irregularities, helping doctors assess heart health. EKGs are commonly used to diagnose various heart conditions, such as arrhythmias, heart attacks, and heart disease. The test is quick, non-invasive, and painless, making it a valuable tool in routine check-ups and emergency situations to monitor heart function.