An ECG monitor is a medical device used to measure and display the electrical activity of the heart. It records the heart's rhythm and can help detect various heart conditions, such as arrhythmias or heart attacks. The monitor typically uses electrodes placed on the skin to capture electrical signals, which are then displayed as waveforms on a screen. These monitors are commonly used in hospitals, clinics, and emergency settings. They provide real-time data, allowing healthcare professionals to assess a patient's heart health quickly. By analyzing the information from an ECG monitor, doctors can make informed decisions about treatment and care.