"prefetch_related and select_related works on the same principle of prefetching data from the database"

i am not agree with that.

select_related adds join to other table in first queryset. On obj.init "select_related" adds data to propertly arguments of object. select_related dont changes the number of requests to DB

prefetch_related - mades a new some requests to some tables in DB. It happens strictly after the first request, where collection of objects_id created before and for this prefetch.

it is two completely different features in django, they works and use differents methods and number of queryes are different.