HTML5 is a markup language used for structuring and presenting content for the World Wide Web and a core technology of the Internet.
CSS is a style sheet language used for describing the presentation semantics of a document written in a markup language.
As part of web browsers, implementations allow client-side scripts to interact with the user and control the browser.
PHP is a server side language used by millions of websites for back end infrastructure and client-server communication.
Joomla! is an open source CMS (Content Management System) based on PHP and MySQL, which runs on a web hosting service.
Mobile devices nowadays use Android/Ios/Windows operating systems thus making them "smart" and capable of implementing various complex tasks. That is succeeded with apps that are installed on the device through marketplaces and perform tasks that a regular phone could not.
A quick brown fox jumps over the lazy dog. A quick brown fox jumps over the lazy dog. A quick brown fox jumps over the lazy dog.