Ruby on Rails is a popular web development technology. It is simple, efficient, and often termed as the 'startup technology.' Over 3.7 million web apps use Ruby on Rails. However, what makes rapid prototyping possible are the Ruby on Rails gems. They drastically reduce the time taken to code.
Gems in Rails are libraries that allow any Ruby on Rails developer to add functionalities without writing code. You can also call Ruby on Rails gems as plugins for adding features. There are RubyGems for almost everything, from authentication to payment gateway processing.