J
WEB DEVELOPMENT
JavaScript
Also known as: JS, ECMAScript
Definition
JavaScript is the programming language of the web. Originally created to make web pages interactive, it now runs everywhere — browsers, servers (Node.js), mobile apps, and even embedded devices.
Simple Explanation
If HTML is the structure of a website and CSS is the styling, JavaScript is the behavior. It makes buttons respond to clicks, forms validate input, data update in real-time, and animations smooth.
Real-World Use Case
A form that validates email format as you type, or a shopping cart that updates totals instantly.
Examples
TypeScriptNode.jsDenoBunReactVueSvelte
Related Terms
Learn More
- MDN JavaScript Reference
- ECMA-262 Standard