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A Beginner's guide to Ruby on Rails MVC (Model View Controller) Pattern is a high-level system architecture that can be used for an app’s global architecture as much as for a small part of it. It breaks the components of your app in three parts: the Model, the View, and the Controller. The majority of OOP (Object Oriented Programming) applications can benefit from the MVC pattern. Using such a pattern will make the code more reusable and enhance the interface definition since each layer takes care of its tasks.