Awanish Ranjan

Django comes with a powerful database-abstraction API that allows you to create, retrieve, update, and delete objects easily. The Django ORM is compatible with MySQL, PostgreSQL, SQLite, and Oracle. Remember that you can define the database of your project by editing the DATABASES setting in the settings.py file of your project. Django can work with multiple databases at a time and you can even program database routers that handle the data in any way you like.

The QuerySet can be written for different kinds of purposes but it will not interact with databse unless it is evaluated.

Iteration: You can write a QuerySet and iterate over it. For example, you have a database of books. You can write a QuerySet and iterate over the returned data to access each of the different records one at a time.