What is JavaScript?

JavaScript is a high-level, interpreted programming language primarily used to make web pages interactive and dynamic. It runs directly in the browser and allows developers to add behavior to websites — such as responding to user actions, manipulating HTML and CSS, handling data, and communicating with servers.

Key Characteristics:

• Client-side scripting language (though it can also run on the server via Node.js)

• Lightweight and versatile

• Supports object-oriented, functional, and event-driven programming

• Works seamlessly with HTML and CSS to create modern web experiences

What Can JavaScript Do?

• Validate form inputs on the client side

• Create interactive features like sliders, modals, dropdowns, etc.

• Dynamically update content without refreshing the page (via AJAX or fetch)

• Control multimedia: play audio/video, interact with canvas

• Build full-stack apps with the help of libraries and frameworks (like React, Vue, Node.js, etc.)

Where Does JavaScript Run?

• In the browser: Chrome, Firefox, Safari, Edge, etc.

• On the server: Using Node.js

• In hybrid mobile apps: Like those built with React Native or Ionic

• In desktop applications: With tools like Electron.js