A defibrillator is a medical device used to restart a heart that has stopped beating or restore a normal heartbeat to a heart that is beating irregularly. It works by sending an electric shock to the heart, which can help restore its normal rhythm. Defibrillators are crucial in emergency situations such as cardiac arrests, where immediate action is necessary to save a person's life. They are commonly found in hospitals, ambulances, and other healthcare settings where quick response to heart-related emergencies is essential.

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