Event Loop

Lesson in the JavaScript Roadmap · Stage 13: Using (this) keyword

Last updated 14 September 2026

What is Event Loop?

The Event Loop is one of the most important aspects to understand about Node.js. Why is this so important? Because it explains how Node.js can be asynchronous and have non-blocking I/O, it explains the "killer feature" of Node.js, which made it this successful.

Study this in the interactive course See the whole JavaScript roadmap

Free resources to learn Event Loop

ArticleThe Node.Js Event Loop
ArticleJavaScript Visualized: Event Loop
VideoWhat the heck is the event loop anyway?
VideoIn the loop: JS conf 2018

Event Loop: common questions

Can I learn Event Loop 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 Event Loop 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 Event Loop tutorial for beginners?

It is lesson 100 of 124 in the free JavaScript roadmap, in stage 13, Using (this) keyword. If you are new to JavaScript, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.