Sinatra
Sinatra is a lightweight, domain-specific language (DSL) web application framework written in Ruby. It is designed for quickly creating web applications and APIs with minimal code and configuration, emphasizing simplicity and flexibility. Unlike full-stack frameworks like Ruby on Rails, Sinatra provides a minimalistic approach, allowing developers to build small to medium-sized applications or microservices efficiently.
Developers should learn Sinatra when they need to build simple web applications, RESTful APIs, or microservices without the overhead of a full-stack framework. It is ideal for prototyping, small projects, or when you want fine-grained control over your application's structure and dependencies. Use cases include creating quick APIs for mobile apps, building lightweight web services, or developing small internal tools where rapid development and minimalism are priorities.