A cardiac arrest occurs when the heart suddenly stops beating, preventing blood from flowing to the brain and other vital organs. This can happen due to various reasons, such as a heart attack, an electrical problem in the heart, or severe trauma. Without immediate treatment, a person can lose consciousness and stop breathing within minutes. To save someone experiencing a cardiac arrest, it's crucial to act quickly. Performing CPR (cardiopulmonary resuscitation) can help maintain blood flow until emergency services arrive. Using an AED (automated external defibrillator) can also restore a normal heart rhythm. Quick action can significantly increase the chances of survival.