Node.js is an open-source, cross-platform JavaScript runtime environment that allows developers to run JavaScript code outside of a web browser. It is built on the V8 JavaScript engine, which is the same engine used by Google Chrome. Node.js enables developers to use JavaScript for server-side scripting, enabling them to build scalable, high-performance web applications and backend services.

Advantage of Node.js

1. Open source
2. Efficient Fast and highly scalable
3. Event Driven
4. Very popular

How to run node js ?

1. Install Node.js: If you haven’t already installed Node.js on your system, you can download it from the official website: Node.js Downloads. Follow the installation instructions for your operating system.
2. Create a Node.js file: Create a JavaScript file with a .js extension that contains your Node.js code. You can use any text editor or an integrated development environment (IDE) to create this file.
3. Write your Node.js code: Write your Node.js code inside the .js file. This can be a simple “Hello, World!” program or more complex code depending on what you want to achieve.Here’s an example of a simple “Hello, World!” program in Node.js:

1st step create below file

hellow.js

and put below code

console.log("this is our first node js program");

Output:-