HTML (HyperText Markup Language) is the foundational markup language used to structure static web content, while DHTML (Dynamic HTML) is an umbrella term for a combination of technologies used to create interactive and animated websites.. Crucially, DHTML is not a distinct coding language or file extension; it is simply the practice of using HTML, CSS, JavaScript, and the Document Object Model (DOM) together to change a page's content and styles in real-time without reloading the server.