Sinatra is a free and open source software web application library and domain-specific language written in Ruby. It provides both the beginner and the experienced professional with a tool for creating simple, yet powerful web applications.Instant Sinatra Starter is a practical, hands-on guide that provides you with the necessary knowledge to get started from scratch.Including all the necessary steps to put together a Sinatra application and get it online, we will also learn all that you need to know to make your application all it can and should be.We'll learn how a web request is received, pre-processed by Rack and Sinatra middleware, then handed to the application. Learn how to build a response via templates, then hand the response back to be sent to the client.LLater we will learn to configure your application for your specific needs and handle more complex requests and responses. With Instant Sinatra Starter, we'll explore the essentials to get our first Sinatra application online.