Rails has helped many companies reach millions of users and billions of market valuations over the past 20 years. Rails has been contributed by over six thousand people. Many more have helped the community with documentation, evangelism and bug reports. Rendering HTML templates, updating databases and sending and receiving email, maintaining live pages via WebSockets. Enqueue jobs for asynchronous work, storing uploads on the cloud, and providing solid security protections against common attacks. Databases become alive with rich objects that contain business logic. It allows you to model relationships between tables, provide callbacks when saved, protect sensitive data, and beautifully express SQL queries. The controllers expose the domain model to web, process incoming parameters and set caching headers. They also render templates, responding with HTML or JSON.