HyperText Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It forms the basic structure of web pages and is a cornerstone technology of the World Wide Web, alongside CSS for presentation and JavaScript for interactivity.
JavaScript is a high-level, interpreted (or just-in-time compiled) programming language that conforms to the ECMAScript specification. It is a core technology of the World Wide Web, alongside HTML and CSS, and is used by the vast majority of websites for client-side page behavior. As a multi-paradigm language, it supports event-driven, functional, and imperative programming styles.