How this Line of code works

In below code i didnt understand how colored line of code is working with template code ?

why we are passing Question and primary key? instead of dictionary to context variable.

plz help me to get out of this confusion.

thanking you.

 view.py

from django.shortcuts import get_object_or_404, render

from .models import Question

# ...

def detail(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    return render(request, 'polls/detail.html', {'question': question})

 detail.html

<h1>{{ question.question_text }}</h1>

<ul>

{% for choice in question.choice_set.all %}

    <li>{{ choice.choice_text }}</li>

{% endfor %}

</ul>

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