what is ruby on rails

Rails is a full-stack framework for developing database-backed web applications according to the MVC (Model-View-Control) pattern. From the Ajax in the view, to the request and response in the controller, to the domain model wrapping the database, Rails gives you a pure-Ruby development environment. To go live, all you need to add is a database and a web server.

RoR homepage: http://www.rubyonrails.org/