Ruby on Rails (Rails) is an open-source web application framework written in Ruby, designed to simplify and accelerate web development. It follows the Model-View-Controller (MVC) architecture and emphasizes convention over configuration, making it a preferred choice for building scalable and maintainable web applications.

Features of Ruby on Rails:

• Follows the MVC architecture for clean and organized code structure.
• Emphasizes convention over configuration (CoC) and don’t repeat yourself (DRY) principles.
• Includes built-in tools for database migrations, automated testing, and security.
• Supports RESTful design patterns for efficient API development.
• Offers a rich ecosystem of gems (libraries) for extending functionality.

To Check the installed version of ruby, run:
$ruby -v

To Check the installed version of rails, run:
$rails -v

Disclaimer: Ruby on Rails is an open-source project distributed under the MIT license. It is provided "as is" without any warranty, express or implied. Users are responsible for configuring and using Rails according to their project requirements and security best practices.