CSS will be used to format the various content defined by HTML by applying styles to them. The HTML will therefore create the structure of the pages while the CSS will allow us to modify the appearance of the contents of the page.
Hypertext Preprocessor, better known by its acronym PHP, is a free programming language, mainly used to produce dynamic web pages through an HTTP server. MySQL is a relational database management system.
Java is a computer technique initially developed by Sun Microsystems and then acquired by Oracle following the takeover of the company. Originally defined as a programming language, Java has evolved into a cohesive set of technical and non-technical elements.
Ruby is a free programming language. It is interpreted, object oriented and multi-paradigm. The language was standardized in Japan in 2011, and in 2012 by the International Organization for Standardization.
ActionScript is a programming language used in client and server applications, or as a scripting language in the Unity graphics engine. ActionScript is an object-oriented, prototype scripting language based on ECMAScript.