Automated external defibrillators (AEDs) are machines that are programmed to safely deliver an electrical shock to a person who has collapsed from a heart problem. Each AED has instructions for that machine.
AEDs are in many public places. Before you use an AED, follow all the steps for CPR. To use an AED, place it next to the person who has collapsed and turn it on. The AED has a computer inside that will tell you what to do next.