Cardiac monitors are medical devices used to continuously track the electrical activity of the heart, providing real-time data on heart rate, rhythm, and other cardiac parameters. They help detect issues like arrhythmias and heart attacks, enabling timely intervention. Key components include electrodes for detecting heart activity, a display screen for real-time monitoring, an alarm system for abnormal readings, and a control panel for adjusting settings. These monitors are widely used in hospitals, ICUs, and during surgeries for continuous heart monitoring and early detection of cardiac problems.