Introduction to JavaScript

What is JavaScript?

JavaScript is a lightweight, interpreted programming language that adds interactivity and dynamic behavior to web pages. Originally created for browsers, it now also runs on servers via Node.js.

Why Learn JavaScript?

• It's the only language that runs natively inside every web browser.
• Used on both the frontend (React, Vue, Angular) and backend (Node.js, Express).
• Huge ecosystem of libraries and frameworks for almost any use case.
• Essential skill for full stack web development.

How JavaScript Works in the Browser

JavaScript is embedded in HTML using <script> tags and executed by the browser's JavaScript engine, allowing it to manipulate the DOM, handle events, and communicate with servers.

<script>
  console.log("Hello, JavaScript!");
</script>