What is JavaScript commonly used for?

JavaScript is widely recognized for its ability to interact with HTML, which allows developers to create dynamic content on web pages. This interactivity is a cornerstone of modern web development; for instance, JavaScript can be used to change the content displayed on a page without needing to refresh it, respond to user events (like clicks or keyboard input), and manipulate the Document Object Model (DOM). By altering the DOM in real-time, JavaScript enhances the user experience, making web applications more engaging and responsive.

In contrast, creating static web pages is typically the role of HTML and CSS, while designing layouts falls under the purview of CSS. Database management usually involves server-side languages or SQL, rather than client-side scripting like JavaScript. Thus, while these other options play crucial roles in web development, they do not encapsulate the primary function of JavaScript, which is to enable dynamic interaction with web pages.