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Ruby on Rails, often simply referred to as Rails, is an open-source web application framework written in Ruby. It follows the model-view-controller (MVC) architectural pattern and emphasizes the use of convention over configuration, which drastically reduces the number of decisions developers need to make. This makes Rails particularly suitable for rapid application development and prototyping. Developers love it for its focus on simplicity and productivity, allowing them to build applications quickly and efficiently.

Key features of Ruby on Rails include built-in tools for database migration, a robust set of libraries (gems) that simplify common tasks, and a well-defined structure that promotes good software design. Rails encourages the use of RESTful application design, making it easier to develop modern web services. With a strong community and comprehensive documentation, Ruby on Rails has been a go-to framework for startups and established companies alike, providing a stable and scalable foundation for web applications. While Rails is free to use as an open-source software, companies often incur costs related to hosting and maintenance of their web applications. Teams choose Ruby on Rails for its rich ecosystem, its focus on developer happiness, and its ability to speed up the development timeline significantly.