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Sinatra is a domain-specific language for building web applications in Ruby. It is designed to be lightweight and easy to use, and is an alternative to more full-featured web application frameworks such as Ruby on Rails. Sinatra allows you to build web applications quickly, with minimal code and configuration, and is well-suited for building simple, single-page applications or for prototyping. It uses a routing system to map URLs to code, and makes it easy to define actions that are triggered by specific HTTP verbs (such as GET, POST, and DELETE).