JavaScript is widely used for scripting in web development. It provides the interactivity and dynamic content that modern websites require, enabling the creation of responsive user interfaces. JavaScript runs in the browser, allowing developers to enhance user experiences through real-time updates without needing to reload the webpage. Furthermore, it integrates seamlessly with HTML and CSS, making it an essential part of front-end development. Additionally, its versatility and extensive ecosystem of libraries and frameworks, such as React and Node.js, contribute to its popularity in the web development landscape.