Answer
Zones track asynchronous operations and notify Angular when to run change detection.
They eliminate the need to manually update the UI after async tasks, simplifying app development.
Quick Answer
Zone.js patches all browser async APIs (setTimeout, Promise, fetch, event listeners) to notify Angular when async operations complete. This is how Angular knows when to run change detection automatically. NgZone.runOutsideAngular() lets you run code without triggering change detection (useful for performance-heavy operations like animations or setInterval that don't need UI updates).
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ