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Rails is a full-stack, open-source web framework that enables you to create full-featured, sophisticated web-based applications, but with a twist... A full Rails application probably has less total code than the XML you'd need to configure the same application in other frameworks.
Forget XML. Everything in Rails, from templates to control flow to business logic, is written in Ruby, the language of choice for programmers who like to get the job done well (and leave work on time for a change).
Ruby on Rails is a Web application framework that aims to provide an easy path to application development. In fact, the framework's proponents claim that Ruby on Rails developers can be up to ten times more productive than they would be when using traditional J2EE frameworks. (Read the article titled "Rolling with Ruby on Rails" for more on this claim; see Resources). While this statement has been the source of considerable debate in the Rails and J2EE communities, little has actually been said about how Rails and J2EE architectures compare.