An Automated External Defibrillator (AED) is a medical device used to diagnose and treat sudden cardiac arrest (SCA) in individuals who are experiencing a life-threatening arrhythmia. AEDs are designed to provide a shock to the heart in order to restore a normal rhythm. These devices are portable, user-friendly, and can be used by anyone with basic training. They are commonly found in public places such as airports, schools, and shopping malls, as well as in healthcare facilities and on emergency response vehicles. The use of an AED can significantly increase the chances of survival for individuals experiencing SCA.