After having set up a "polls" app in our "djangoTest" proje…
After having set up a "polls" app in our "djangoTest" project, and created models in our polls app, you have to activate those models in the project by first adding polls to INSTALLED_APPS setting of djangoTest and then running a `python3 manage.py makemigrations polls` command
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So a migration is just a set of SQL code that when run updates your SQL tables by adding new models you created or changes to models you made, instead of you manually having to write the SQL commands yourself