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HTML stands for Hyper Text Markup Language; is the standard markup language for creating Web pages; describes the structure of a Web page; HTML elements tell the browser how to display the content; HTML elements label pieces of content such as "this is a heading", "this is a paragraph", "this is a link", etc.
CSS stands for Cascading Style Sheets; CSS describes how HTML elements are to be displayed on screen, paper, or in other media; it can control the layout of multiple web pages all at once; external stylesheets are stored in CSS files
JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.
PHP is an acronym for "PHP: Hypertext Preprocessor"; is widely-used, open source scripting language; Its scripts are executed on the server and is free to download and use