Rails 1.0 brought us a revolutionary way to think about web development.
Rails 2.0 brought us a cleaner, stable day-to-day API for building applications in Rails.
And
Rails 3.0 bring us speed, extensibility, and a richer ecosystem.
Ruby on Rails
The Ruby on Rails is a framework designed for quickly and cleanly writing web application. Ruby on Rails often shortened to Rails or RoR. Rails application are developed using the Model View Controller (MVC) pattern. It is intended to be used with an agile development methodology that is used by web developers for rapid development.
Rails debuted in late 2004 and changed the way a lot of people think about web development.