Automated External Defibrillators (AED) are portable electronic devices that automatically diagnose two life-threatening cardiac arrhythmias — ventricular fibrillation (V-Fib) and pulseless ventricular tachycardia (V-Tach) in collapsed patients. AEDs treat patients by guiding people through automated defibrillation techniques using simple operation.

Defibrillation is the application of electrical therapy which stops a cardiac arrhythmia — allowing the heart to reestablish an effective rhythm.