Ruby on Rail is a free web application framework, which intends to increase the speed and straightforwardness with which database-driven web sites can be created and offers skeleton code frameworks from the outset. Often shortened to Rails, or ROR, Ruby On Rails is an project written in the Ruby programming language and applications using the Rails framework are developed using the Rails framework are developed using the Model-View-Controller Design Pattern.

Rails is a full-stack framework for developing database-backed web applications according to the 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.

Ruby on Rails strives for applications with less code, through guiding principles that include "Don't repeat yourself" (code should never be redundant) and "Convention over configuration" (programmers only need to specify when their setup differs from the norm).

Rails provides out-of-the-box scaffolding, which can quickly construct most of the logic and views needed for a basic website, the WEBrick web server and other helpful development tools.