Get started with Ruby on Rails development with this easy to understand online course designed for those who are new to Rails. What Is Ruby on Rails? Ruby on Rails, often simply Rails, is an open sourceweb application framework which runs on the Ruby programming language. It is a full-stack framework: it allows creating pages and applications that gather information from the web server, talk to or query the database, and render templates out of the box. As a result, Rails features a routing system that is independent of the web server.