noob syntax question

Hi,
In the tutorial 1.

It has this:
# Give the Poll a couple of Choices. The create call constructs a new
# choice object, does the INSERT statement, adds the choice to the set
# of available choices and returns the new Choice object. Django
creates
# a set to hold the "other side" of a ForeignKey relation
# (e.g. a poll's choices) which can be accessed via the API.

and gives these examples:
# Create three choices.
>>> p.choice_set.create(choice='Not much', votes=0)
<Choice: Not much>
>>> p.choice_set.create(choice='The sky', votes=0)
<Choice: The sky>
>>> c = p.choice_set.create(choice='Just hacking again', votes=0)

I understand what its doing, but I don't understand where the "_set"
comes from or where its resolved to.
Its probably more of a python thing than a django thing, but if
someone could provide insight, it would be much appreciate.

Thanks,
-j

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