[Python] What does order_by() do in Django?

Documentation says order_by() returns a new QuerySet.

When I print Question.objects.order_by('-pub_date') where Question is class name in models.py it prints queryset object.

I am confused whether order_by() returns a new Queryset or executes a query?

What is happening internally during execution in Django in below code?

from django.http import HttpResponse
from .models import Question
def index(request):
latest_question_list = Question.objects.order_by('-pub_date')[:5]
output = ', '.join([q.question_text for q in latest_question_list])
return HttpResponse(output)


Also please explain line 5 in above code?

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