An electrocardiogram (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 timing and strength of these signals, helping doctors assess heart health and identify issues such as arrhythmias or heart attacks. ECGs are non-invasive and typically take only a few minutes to perform. They are commonly used in hospitals, clinics, and during routine check-ups. By analyzing the ECG results, healthcare professionals can make informed decisions about treatment and further testing if necessary.