not clear about the name= part of url rooting

hello all,
I was going through the basic tutorial for django 1.8
I see in the 3rd part on views this line.
url(r'^(?P<question_id>[0-9]+)/$', views.details, name='detail'),
I have not understood the name = 'details' part?
is 'details' a parameter that will have a input value?
I am confused because we have already associated the views.detail
function to the root.
Can some one explain?
happy hacking.
Krishnakant.

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