MVC (Model-View-Controller) is a software design pattern built around the interconnection of three main component types, in a programming language such as PHP, often with a strong focus on object-oriented programming (OOP) software paradigms.

The three component types are loosely termed models, views, and controllers. Let’s talk about them individually and then see how they fit together.

 

1.  The model is where all the business logic of an application is kept. Business logic can be anything specific to how an application stores data, or uses third-party services, in order to fulfill its business requirements. If the application should access information in a database, the code to do that would be kept in the model. If it needed, for example, to fetch stock data or tweet about a new product, that code would also be kept in the model.

 

2. The view is where all of the user interface elements of our application are kept. This can include our HTML markup, CSS style sheets, and JavaScript files. Anything a user sees or interacts with can be kept in a view, and sometimes what the user sees is actually a combination of many different views in the same request.

 

3. The controller is the component that connects models and views together. Controllers isolate the business logic of a model from the user interface elements of a view, and handle how the application will respond to user interaction in the view. Controllers are the first point of entry into this trio of components, because the request is first passed to a controller, which will then instantiate the models and views required to fulfill a request to the application.