Definitions

 HTML -  HTML stands for Hyper Text Markup Language. HTML allows the creation and structuring of sections, texts and links.

CSS - Cascading Style Sheets or CSS is a programming language that allows developers to alter how documents are presented to the users. 

Javascript - A scripting language that allows the implementation of complex features in a web page like 2D or 3D animations.

Python -  Python is a high-level programming language that is often used to automate tasks, create websites and programs, and perform analysis of data.

Ruby - Ruby is a high-level language that is used for scraping the web and processing data.