HTML5 is a markup language used for structuring and presenting content on the World Wide Web. It was finalized, and published, on 28 October 2014 by the World Wide Web Consortium (W3C). This is the fifth revision of the HTML standard since the inception of the World Wide Web. The previous version, HTML 4, was standardized in 1997. Its core aims are to improve the language with support for the latest multimedia while keeping it easily readable by humans and consistently understood by computers and devices (web browsers, parsers, etc.). HTML5 is intended to subsume not only HTML4, but also XHTML 1 and DOM level 2 HTML.
Ruby on Rails, often called RoR or simply Rails, it's an open source framework for web applications written in Ruby
Ruby is a dynamic, reflective, object-oriented, general-purpose programming language
Django it's an open source framework for web applications development, written in Python