An Automated External Defibrillator (AED) is a portable electronic device that automatically diagnoses and treats cardiac arrest, effectively saving lives during critical emergencies. Coursera's AED skill catalogue teaches you about the vital role of these devices in emergency medical response. You'll learn how to operate AEDs correctly during stressful situations, understand the science behind cardiac rhythms, and identify the specific circumstances that warrant AED use. Additionally, you'll gain knowledge on the safety procedures and legal implications surrounding AED use, equipping you with the comprehensive skills to become a proficient first responder or enhance your abilities in the healthcare field.