Think of a website like a house.

You have the main structure, which is built with HTML (HyperText Markup Language). This is like the walls, floors, and rooms of the house. It defines the content and layout.

Then you have the style and design, which is done with CSS (Cascading Style Sheets). This is like the paint colors, the furniture, the decorations, and the wallpaper. It makes the house look nice.

But for the house to actually do things—for the lights to turn on, for the doors to open, or for a video to play on a TV—you need something to make it work. That's where JavaScript comes in.

JavaScript is the action. It's the programming language that makes websites interactive and dynamic. It's the "verb" of the internet.

Here are some simple examples of what JavaScript does:

When you click a button on a website and a pop-up window appears, that's JavaScript.

When you fill out a form and the website checks if your email address is valid before you submit it, that's JavaScript.

When a photo slideshow on a website automatically changes pictures, that's JavaScript.

When you see a cool animation or a moving graphic on a page, that's JavaScript.

Without JavaScript, the web would just be static pages of text and images. It's the engine that makes the internet a lively, interactive place instead of just a digital book.