The Model View Controller (MVC) design pattern contains a clear distinction between processing control, data model and displaying the data in the interface. These three areas are formally distinguished from each other by three objects: model, view and controller. As a result, you can easily split Web applications into logical units.

The model is used as an application object of the application data administration. It responds to information requests about its status, which usually come from the view, as well as to statements for status changes, which are usually sent by the controller. In this way, only the model is used to process data internally, without making reference to the application and its user interface.
There can be different views for a model, which can be implemented using different view pages.

The view handles the graphical and textual output at the interface and therefore represents the input and output data in each interface element, such as pushbuttons, menus, dialog boxes and so on. The view takes of visualization. To visualize the status, the view queries the model, or the model informs the view about possible status changes.

The controller interprets and monitors the data that is input by the user using the mouse and the keyboard, causing the model or the view later to change if necessary. Input data is forwarded and changes to the model data are initiated. The controller uses the model methods to change the internal status and then informs the view about this. This is how the controller determines reactions to the user input and controls processing.

The view and the controller together form the user interface.

Since the model does not recognize either views or the controller, internal data processing is detached from the user interface. As a result, changes to the user interface have no effect on internal data processing and the data structure. You also have the option, however, of displaying the data in different formats; you can display election results as a table, a bar chart or as a pie chart.

You can find additional information about the MVC design pattern on the Internet and in current specialist literature.