An Ambu Bag is a handheld device used to provide artificial ventilation. It is used during emergencies when a patient stops breathing. It pushes air into the lungs manually. It is connected to a face mask or endotracheal tube. It is used before ventilator support. It is essential in emergency crash carts. It is simple to operate. It does not require electricity. It is lifesaving equipment. It is commonly used in cardiac arrest cases.