What are Django apps and how do they differ from projects?

A project is the whole Django application, and an app is a module inside it that handles one area of functionality. The project holds the settings, the configuration and the root URLs, and it contains several apps.

An app is a Python package for one feature, such as a blog or user accounts. You switch it on by adding it to INSTALLED_APPS. Because an app does not depend on one project, you can reuse it across different projects.

Apps should follow the single responsibility principle: each app has one clear purpose. A blog app should not also handle billing.

myproject/          # Project
├── blog/          # App
├── users/         # App
├── settings.py    # Project settings
└── urls.py        # Project URLs