What is the role of the migration system in Django and why is it used when working with a database?

The migration system in Django is responsible for managing changes in the database schema that correspond to changes in the application's models. It allows for automatically creating, applying, and rolling back schema changes (such as adding new tables, fields, changing data types) without manually writing SQL queries.

Main tasks of migrations:

• Synchronizing Django models with the database.
• Simplifying the process of updating the database during project development.
• Ability to rollback changes in case of errors.

Example usage:

python manage.py makemigrations  # Creates migration files based on model changes
python manage.py migrate         # Applies migrations to the database

Thus, migrations provide a convenient and safe way to manage the database structure during development.