Introduction To JavaScript

JavaScript (JS) is a lightweight, high-level, interpreted programming language primarily used to make web pages interactive and dynamic. It was created in 1995 by Brendan Eich at Netscape. Unlike HTML (structure) and CSS (style), JavaScript adds behavior to websites, enabling features like form validation, animations, interactive maps, dropdowns, and real-time updates. Today, JavaScript is not limited to the browser—it runs on servers too (with Node.js) and is one of the most widely used languages in the world for web, mobile, and even desktop app development.

Key Features of JavaScript 

1. Simple and Easy to Learn – Beginner-friendly with syntax similar to C and Java. 

2. Interpreted Language – Executes directly in the browser without  compilation. 

3. Object-Oriented – Supports objects, prototypes, and classes for  structured coding. 

4. Event-Driven – Can respond to user actions like clicks, keypresses, and  mouse movements. 

5. Dynamic Typing – Variables do not require explicit data type  declarations. 

6. Client-Side Execution – Runs in the user’s browser, reducing server load  and improving speed. 

7. Cross-Platform – Works across all major browsers and operating  systems. 

8. Supports Asynchronous Programming – Features like callbacks,  promises, and async/await enable smooth handling of tasks like API calls. 

9. Rich Libraries and Frameworks – Huge ecosystem (React, Angular,  Vue, Node.js, Express.js, etc.). 

10. Versatile – Used for web apps, mobile apps, games, backend  development, and more.