Enhanced Developer Productivity
Ruby on Rails framework uses the MVC (model-view-controller) pattern to bring structure to web applications. It also follows convention over configuration paradigm and DRY (Don't Repeat Yourself) principle, which results in the enhanced developer productivity.
Enterprise and Consumer Apps
Ruby on Rails initially gained popularity with startups and small companies. Twitter, Github, Basecamp, and Scribd are a few popular sites built on RoR. Today, big players such as Amazon and eBay are also using Rails. Moreover, RoR is no longer limited to the consumer web; enterprise applications are also adopting Rails.