Is it necessary to create an app in Django?

The difference between Project and App in Django is that the Project could be defined as the entire application, containing apps to perform specific tasks. And Apps are within the Project that is self-sufficient in a project and are designed to perform specific tasks.

Both sources agree that you should create a separate app in the following situations: If you plan to reuse your app in another Django project (especially if you plan to publish it for others to reuse). If the app has few or no dependencies between it and another app.

How to Move a Django Model to Another App