Sinatra is a lightweight web framework. Sinatra is similar to Ruby on Rails web frameworks. It's pretty different from Rails as it's much lighter (less overhead), and you have more fine-grained control over your web app. Additionally, there is no built-in database functionality or page rendering — all of that is done manually. So it is more popular among millennials as you can bend it like the way you need. Sinatra Introduction Unlike Ruby on Rails, which is a Full Stack Web Development Framework that provides everything needed from front to back, Sinatra is fast, simple and efficient. However, with that comes more work and more room for error. Sinatra is best used for smaller web applications or ones that don't