What type of defibrillator is a cardioverter-defibrillator?

All of them: All cardiac defibrillators are cardioverter-defibrillators.

Two types: External and internal. External automated external defibrillator (AED) is placed over the skin. Internal under the skin with wire in the heart, implantable cardioverter-defibrillators work by detecting and stopping abnormal heartbeats. An implantable cardioverter-defibrillator continuously monitors your heartbeat and delivers extra beats or electrical shocks to restore a normal heart rhythm.