Defibrillation is a medical procedure used to restore a normal heartbeat in individuals experiencing life-threatening heart rhythms, such as ventricular fibrillation or pulseless ventricular tachycardia. It involves delivering an electric shock to the heart through a device called a defibrillator, which can be automated or manual. This shock helps reset the heart's electrical activity, allowing it to regain a regular rhythm. Defibrillators are commonly found in hospitals, ambulances, and public spaces, making them accessible during emergencies. There are two main types: automated external defibrillators (AEDs), which are user-friendly and designed for laypersons, and manual defibrillators, used by trained medical professionals.