Android is a complete set of software for mobile devices such as tablet computers, smartphones, set-top boxes etc.
The language for building web pages. HTML is the standard markup language for creating Web pages.
Cascading Style Sheets which describes how HTML elements are to be shown on screen.
PHP is a server scripting language, and a powerful tool for making dynamic and interactive Web pages.
Java is a programming language.
Java is used to develop mobile apps, web apps, desktop apps, games and much more.