Ruby on Rails : What is it?
Often called RoR, or just Rails, is an open source web application framework for the Ruby programming language that closely follows the Model-View-Controller (MVC) architecture. It strives for simplicity and allowing real-world applications to be developed in less code than other frameworks and with a minimum of configuration. It is intended to be used with an Agile development methodology, which is often utilized by web developers for its suitability for short, client-driven projects.

Ruby on Rails: What it do?
What can any language-framework pair do for an organization? If there are answers popping up in your mind, be kind enough to consider the same for Ruby on Rails. RoR can do all that in a much easier, faster and cost effective way. On the other hand if you don’t know the answers yet, here is a glimpse of what RoR can do:
·         Build customer centric small/medium websites
·         Deploy a web product with advanced (web 2.0 -ish) features in a very limited time.
·         Create automated testing frameworks 
·         Legacy Application extension, integration and migration

Why only ruby on rails?
If you are on the initial stages of paranoia you may like to consider other languages and frameworks, develop a few projects and find out the difference. If you are confident enough to rely on what the open source community has to say, hear this:
·         Productivity gains: exponential savings because of smaller teams, more productivity, improved time to market.
·         Easy development, easy maintenance : Lesser lines of code (10 times less than Java) , makes development faster and maintenance easier
·         Agility: Rails is Agile, no matter how confused you are on your business concept, rails will help you visualize. It adapts to your changing requirements quickly and easily.
·         Free: Its free and open source, can’t talk more on cost effectiveness.
·         Powerful: Its can be simply put as what you SEEK is what you get.

What RoR has done already?
Testimonials: Some live projects singing the success story for ruby on rails.
       Amazon.com: Yes! The same Amazon.com
       Basecamp: project management tool by 37 signals
       Bixee: An upcoming Indian job portal
       BharathRentals: India’s car rental service
       Dimewise: personal finance management
       HBO Asia: HBO’s Asian broadcast online
       Scribd: online document sharing and publishing
       Shopify: e-commerce
       simplifyMD: digital chart room for small hospitals
       Twitter: Online community and social networking

What you should know?
Exposure to any of the programming languages (C, C++, C#, Java) / Scripting languages (Perl, PHP, Ssmalltalk). Overview on how web application works. Understanding of the necessity of Data models, Configuration Management.

Click Here For Ruby on Rails Course Curriculum