Definition
A defibrillator is a device that delivers an electric shock to the heart to restore a normal heartbeat. It's like a reset button for your heart's electrical system. Imagine your phone freezing and needing a restart; a defibrillator does something similar for the heart. It is used in cases of cardiac arrest where the heart's rhythm becomes chaotic or stops. It can be the difference between life and death in emergency situations. Some are automated and can be used by non-medical personnel.