Action Cable is one of the most exciting features of Rails 5. Action Cable allows you to easily add real-time, full-duplex communication to you Rails application, allowing us to build pages that are updated dynamically.
Action Cable uses the WebSocket protocol to enable our server to send real-time messages to individual users or broadcast messages to all currently online users. It provides a very “Rails-like” interface for the entire WebSocket front-end and back-end code, making it very easy for existing Rails developers to add functionality that was previously complex or simply not possible with just Rails.
