NgZone is used by developers to start change detection resulted by async operations automatically. It gives us back control of our code’s execution. It can be used to subscribe to an Observable that is present outside of the angular zone and also to return to the angular zone when reacting to the same Observable.

NgZone Service has always been a fantastic Angular 6 Interview Questions for both freshers and experienced as well.

BY Best Interview Question ON 15 Feb 2019