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Ruby on Rails (RoR) is a cross-platform Web application framework written in Ruby. The framework was originally authored by David Heinemeier Hansson and researched and further developed by a rail core team of several individual contributors. RoR allows a programmer to develop Web applications much faster by minimizing the steps, time and verbiage involved in programming.
RoR is simply known as Rails. The initial release of RoR was in July 2004. RoR is distributed under the MIT license.
Although RoR was originally written to run on the Mongrel Web server, it now supports most webservers and also supports database servers such as MySQL, PostgreSQL, Oracle, SQL server and DB2.