What Is JavaScript and Where It Is Used

JavaScript is a programming language used to make applications dynamic and interactive. It allows code to respond to user actions, process data, and control how things behave.

JavaScript runs in two main environments.

In the browser, it controls what users see and interact with. It handles things like button clicks, form validation, and updating content without reloading the page.

Outside the browser, JavaScript runs on servers using Node.js. In this environment, it is used to handle requests, process data, and build backend logic.

In this course, the focus is on how JavaScript is used on the backend. You will learn how to write code that works with data, handles logic, and prepares you for building real server-side applications.