In the Model-View-Controller principle, what is the Frontend and what is the Backend?

Question

Wikipedia says:

MVC provides front and back ends for the database, the user, and the data processing components. The separation of software systems

Answer 1

Maybe the figure below can help..

MVC               Human language    backend/frontend
---------------   ---------------   ---------------
model          -> data           -> backend
controllers    -> actions        -> backend/frontend (depends on implementation)
views          -> GUI            -> frontend