Sure! Node.js is a JavaScript runtime environment that allows you to run JavaScript code outside of a web browser, usually on the server side.

Here are some key points:

🚀 What is Node.js?

• Built on Chrome’s V8 JavaScript engine (the same engine used in the Chrome browser).

• Allows JavaScript to be used for server-side development.

• Enables full-stack development with a single language — JavaScript — for both frontend and backend.

⚙️ Features of Node.js

• Asynchronous and Event-driven: Handles multiple requests without blocking.

• Non-blocking I/O: Great for I/O-heavy tasks (like APIs, file systems, or databases).

• Single-threaded but highly scalable: Uses event looping to handle many connections efficiently.

• Fast execution: Thanks to the V8 engine.

📦 Node Package Manager (NPM)

• Comes with Node.js.

• Lets you install thousands of open-source libraries (called “packages”) like express, lodash, mongoose, etc.

🧱 Common Use Cases

• REST APIs & Web Apps (e.g., using Express.js)

• Real-time apps (e.g., chat apps with Socket.io)

• Command-line tools

• Microservices

• File processing & automation

🔧 Simple Example (Server using Express)

js
const express = require('express');const app = express();app.get('/', (req, res) => {  res.send('Hello from Node.js!');});app.listen(3000, () => {  console.log('Server running at http://localhost:3000');});