Models(The Definitive Guild to Django)

　　What’s the difference between a project and an app? The difference is that of configuration vs. code:

　　• A project is an instance of a certain set of Django apps, plus the configuration for those apps.

　　• Technically, the only requirement of a project is that it supplies a settings file, which defines the database connection information, the list of installed apps, the TEMPLATE_DIRS, and so forth.

　　• An app is a portable set of Django functionality, usually including models and views, that lives together in a single Python package.

　　• For example, Django comes with a number of apps, such as a commenting system and an automatic admin interface. A key thing to note about these apps is that they’re portable and reusable across multiple projects.