Tutorial three '-pub_date'

Hey Djangoers,

I am on the tutorial 3, and found this code where we are modifying the view index()

    def index(request):      latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5]      output = ', '.join([p.question for p in latest_poll_list])      return HttpResponse(output)  

What I did not understand, was why did we state,

order_by('-pub_date'), what does that '-' mean before 'pub_date' ? 

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Thanks & Regards

Smaran Harihar

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