MVC

Model View Controller, or MVC in short, is a software design pattern used to develop ​GUIs.

The details of the approach are explained well on the ​MVC wiki page. In short,

• A model contains the data that the user is adjusting.
• A view shows the data in a GUI to the user (eg, graph, text field, slider position)
• A controller allows the user to change the data (eg dragging sliders, entering text or numbers, clicking check boxes)

A view and controller can, and often are, merged into a single component. For example a slider shows the current value, but the user can also drag the slider; or a checkbox shows the current setting (on or off) while the user can simply click on it to toggle the value.