HTML and XML are structural foundations of every website or application. It is crucial that developers learn — and master — both.

XML is defined by the World Wide Web Consortium's (W3C') XML 1.0 Specification. It was designed to be general, allowing it to be used in a wide range of applications.

HyperText Markup Language (HTML) is the set of markup symbols or codes used to display on the internet. The markup tells web browsers how to display a webpage’s words and images.

Developers use these client-focused technologies to transform the Controller's data into markup, such as HTML, that's easily displayed in a web browser. RESTful clients don't require marked-up data, ...