HTML

HTML, short for Hypertext Markup Language, is the code that defines the structure of a web page. It is the markup that tells a web browser what is a heading, what is a paragraph, what is a link, and what is an image.

HTML handles structure and meaning, not appearance. The visual styling is the job of CSS, and interactivity comes from JavaScript. Together those three are the core languages of the front-end, but HTML comes first, since the others need a page to work on.