JavaScript is a widely used programming language that makes websites interactive and dynamic. It allows developers to create features such as animations, form validation, dropdown menus, and real-time updates without reloading the page. JavaScript runs directly in the web browser, which makes it fast and efficient for front-end development, and it can also be used on servers with platforms like Node.js. By working together with HTML for structure and CSS for design, JavaScript brings web pages to life and plays a key role in modern web applications .