Could you explain what migrations are in the context of Django and why they are needed?

In Django, migrations are a way to manage changes in the database schema (for example, creating or modifying tables) through code.

When you change models (add a field, change a type, etc.), migrations allow you to automatically generate scripts that update the database without losing data.

Why migrations are needed:

• They keep synchronization between models and the database.
• They allow versioning of database schema changes.
• They facilitate teamwork and deployment, as migrations can be applied sequentially.

Example of usage:

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

Thus, migrations are a convenient tool for safe and controlled modification of the database structure in Django projects.