Zones

Lesson in the Angular Roadmap · Stage 15: Zones

Last updated 14 September 2026

What is Zones?

Zone.js is a signaling mechanism that Angular uses to detect when an application state might have changed. It captures asynchronous operations like setTimeout, network requests, and event listeners. Angular schedules change detection based on signals from Zone.js.

Study this in the interactive course See the whole Angular roadmap

Free resources to learn Zones

Official docsResolving Zone Pollution
Official docsAngular without ZoneJS (Zoneless)
Official docsNgZone - API
VideoWTF is "Zone.js" and is it making your app slow?

Zones: common questions

Can I learn Zones in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Zones in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Zones tutorial for beginners?

It is lesson 88 of 158 in the free Angular roadmap, in stage 15, Zones. If you are new to Angular, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.