Agent Ruby is a programming language designed for building web applications. It is known for its simplicity and productivity, allowing developers to write clean and maintainable code. Ruby emphasizes convention over configuration, which means it provides sensible defaults to streamline the development process. One of the most popular frameworks built on Ruby is Ruby on Rails, which helps developers create robust web applications quickly. Rails follows the Model-View-Controller (MVC) architecture, making it easier to organize code and separate different aspects of an application. This combination of Ruby and Rails has made it a favorite among startups and tech companies.