What is JavaScript?

JavaScript (JS) is a versatile, lightweight programming language used to create dynamic, interactive websites. Initially developed in 1995 for adding simple animations to web pages, it has evolved into a full-stack technology powering frontend frameworks (React, Angular), backend servers (Node.js), and even mobile apps.

Key Features of JavaScript:

• Client-Side Execution: Runs directly in browsers for instant user interactions (e.g., form validation, animations).
• Event-Driven: Responds to user actions like clicks, scrolls, or keystrokes.
• Cross-Platform: Works across all devices and integrates seamlessly with HTML/CSS.

Why Interviewers Ask This Question?

They test your foundational knowledge. A strong answer covers:

1. Definition: "JavaScript is a scripting language for web interactivity."
2. Role in Web Dev: "It manipulates DOM, handles APIs, and builds SPAs."
3. Evolution: Mention ES6+ features (arrow functions, promises).

Pro Tip: Link to real-world examples (e.g., "Google Maps uses JS for real-time updates").