An Automated External Defibrillator (AED) is a portable device designed to treat people experiencing sudden cardiac arrest. It analyzes the heart's rhythm and, if necessary, delivers an electric shock to restore a normal heartbeat. AEDs are user-friendly, featuring voice prompts and visual instructions to guide users through the process. These devices are commonly found in public places such as schools, airports, and shopping centers, making them accessible during emergencies. Training in CPR and AED use is often encouraged, as quick action can significantly increase the chances of survival for individuals in cardiac distress.