What is the role of ngZone in Angular, and how does it help with async operations?

Short answer: NgZone monitors async operations (like promises, timers) and triggers Angular’s change detection automatically after they complete. It helps Angular know when to update the UI. You can run code outside Angular’s zone to avoid unnecessary change detection, improving performance.

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.