Ruby on Rails, or Rails, is a server-side web application framework written in Ruby under the MIT License. Rails is a MVC (model-view-controller) framework, providing default structure for database, a web service, and web pages. We can build a Modern Web Application using Ruby on Rails technology. It makes it much easier to build the modern web application efficiently in less time. It includes everything we need to build fantastic Web Applications and it has huge community for quick help on any technical challenges. It makes it significantly less requesting to develop the front line Web Application profitably in less time. It fuses everything that we need to collect astounding applications and it has a huge system for smart help on any specific troubles.