What is JavaScript used for?

JavaScript is a versatile programming language primarily used to create dynamic and interactive elements on websites. In web development, its main role is to enhance the user experience by enabling features that go beyond static content. For example, JavaScript allows developers to build interactive forms, image sliders, pop-up modals, real-time content updates, animations, and much more—all of which help make websites more engaging and user-friendly. On the client side (in the browser), JavaScript can manipulate HTML and CSS to change the webpage’s structure, style, or content without needing to reload the page. This capability is fundamental to modern web applications, where responsiveness and smooth interactions are essential. Additionally, JavaScript can handle events like mouse clicks, keyboard input, or page loading, making it possible to create highly interactive interfaces. JavaScript is also widely used on the server side through environments like Node.js, allowing developers to build full-stack applications with a single language. Overall, JavaScript is a cornerstone of web development because it bridges static markup and dynamic behavior, enabling rich, interactive web experiences.