Introduction to JavaScript

JavaScript is a high-level programming language used to make web pages interactive and dynamic. It works with HTML and CSS to build responsive websites.

What is JavaScript?

JavaScript runs in the browser and allows real-time user interaction. It is used in websites, web apps, and even server-side programming using Node.js.

Why Use JavaScript?

• Form validation
• Animations and effects
• Live content updates
• AJAX requests without page reload

Key Features

• Object-oriented and functional programming
• Dynamic typing
• Built-in objects: Array, Date, Math
• Support for regular expressions

JavaScript Tools

• Browser APIs (DOM, Canvas, Web Storage)
• Frameworks: React, Angular, Vue
• Server-side: Node.js

Where It Runs

JavaScript runs on all modern browsers and platforms—PC, mobile, tablets—and also on servers and IoT devices.

Why Learn JavaScript?

• Essential for front-end development
• High demand in job market
• Used in web, mobile, game, and server apps

HTML vs CSS vs JavaScript

• HTML: Page structure
• CSS: Styling and layout
• JavaScript: Behavior and interaction

Conclusion: Learning JavaScript is crucial for anyone aiming to become a web developer. It brings websites to life.