Which of the following technologies is often used to create interactive websites?

JavaScript is a key technology for creating interactive websites because it allows developers to implement rich user interfaces and dynamic content. With JavaScript, developers can manipulate the Document Object Model (DOM) in real-time, responding to user actions such as clicks, form submissions, and other interactive events. This capability enables features like animations, updates to the content without reloading the page, and interactive elements such as sliders, tabs, and modals.

In comparison, HTML5 serves primarily as the structure of web pages and can include multimedia elements, but it does not handle interactions directly. PHP is a server-side scripting language used to handle backend processes, and while it can create dynamic web applications, it does not directly manage client-side interactivity. XML is designed to store and transport data, focusing on data description rather than user interaction, making it less relevant for creating interactive features.

Thus, JavaScript stands out as the primary technology for enhancing user interaction in web development.