HTML stands for HyperText Markup Language. It is the standard markup language used to create and structure content on the web.
HTML elements form the building blocks of web pages. Modern HTML includes semantic tags that describe the purpose of content, such as <header>, <section>, and <footer>.
JavaScript is a high-level, interpreted programming language that enables interactive web pages. It runs in the browser and on the server (with Node.js).
Key features include first-class functions, event-driven programming, and a rich ecosystem of libraries and frameworks.