A cardiac monitor is a medical device used to continuously observe and record the heart's electrical activity. It helps healthcare professionals track vital signs, such as heart rate and rhythm, allowing for quick detection of any abnormalities. This device is commonly used in hospitals, especially in intensive care units and during surgeries. Cardiac monitors can be portable or stationary and often come with alarms to alert staff if the patient's heart rate falls outside of normal ranges. They are essential tools in managing patients with conditions like arrhythmias or those recovering from heart surgery.