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This folder structure is not compulsory. If we want to use the Joomla!
MVC, help (preferences button), and JTable subclasses, we must use
the models, views, help, and tables folders.
The MVC
A single Joomla! extension often caters for several user types and several interfaces.
This diagram describes how two different users might access the same system:
Without the MVC, or a similar solution, we would probably end up duplicating
large portions of code when dealing with the HTML and XML views, each of which
would contain elements specific to the view. This is extremely inefficient, intensive to
maintain, and is likely to result in inconsistencies between views.
The MVC design pattern allows us to create code, that is independent of the
interface. This is achieved by separating data access, presentation, and business
logic. Separating these out means that we can refactor any part of an MVC-based
component without affecting other parts of the component.
There are three parts to the MVC design pattern: the model, view, and controller.


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