What JavaScript is used for
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What people build with JavaScript
- JavaScript started as a small language for web pages.
- Today it is everywhere — the same language runs in browsers, on servers, and in apps.
- Here is where you will meet it.
Interactive websites
- Every button, menu, map, and live update you click is powered by JavaScript.
- It runs inside your browser, so the page reacts instantly — no reload needed.
- Sites like Google, YouTube, and Facebook are full of it.
Servers with Node.js
- Node.js lets JavaScript run outside the browser, on servers.
- That means one language can power both the page and the server behind it.
- Big companies like Netflix and PayPal run JavaScript on their servers.
Apps, games, and more
- Mobile and desktop apps can be built with JavaScript — the VS Code editor itself is!
- It also drives browser games, charts, and even hobby robots.
- Learn it once, and you can build for almost any screen.