The pillars of a web page

HTML

Markup language.

Stands for Hypertext Markup Language.

The minimum a web page needs to exist.

It describes the content and the structure of a document.

CSS

Meta-language (it cannot produce results without HTML).

Stands for Cascading Style Sheets.

It is used for styling and positioning HTML elements.

Javascript

Programming language.

It brings interactivity (or better said, a behavior) to web pages (but it is also used as a stand-alone programming language in other fields).

Analogy between the human body and web page technologies