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It's a MVC (Model-View-Controller) web framework made in Python that works with a number of different kinds of databases.

Check out the models overview to get a feel for how powerful and simple it can be to use: https://docs.djangoproject.com/en/1.8/topics/db/models/

Strictly speaking it's a MTV framework (like all traditional web frameworks really).

But half the time people use it as a MVC framework where URL's act as the final link back to the model.