JavaScript plays a crucial role in improving interactivity and user experience on websites. By leveraging JavaScript, developers can create responsive and engaging features such as: Form Validation: JavaScript can validate user inputs in real-time, providing instant feedback and reducing errors. Dynamic Content Updates: JavaScript enables developers to load new content dynamically without requiring a page reload, resulting in a smoother browsing experience. User Interface Enhancements: JavaScript can be used to implement interactive elements, animations, and transitions, making websites more visually appealing and engaging. Client-Side Data Processing: JavaScript allows for client-side data manipulation and calculations, reducing server load and improving performance.