As punishment for a previous rebellion against the Capitol, every year one boy and one girl between the ages of 12 and 18 from each district are selected at random and forced to participate in the Hunger Games, a televised event in which the participants, or "tributes", must fight to the death in a dangerous outdoor arena until only one remains. The story follows fatherless 16-year-old Katniss Everdeen, a girl from District 12 who volunteers for the 74th Games in place of her younger sister, Primrose. Also participating from District 12 is Peeta Mellark, a boy whom Katniss knows from school and who once saved her life by giving her bread when her family was starving." (quote from wiki)
but its an awesome book, my definition is there aare 12 districts or cities that are under the control of the capitol, or like their gonvernment.
every year i think, one girl and one boy are chosen from each district to participate in an annual event called the hunger games which iss pretty much a fight to the death on live T.V that the capitol started to keep the districts in line
and so there the main character, katniss takes the place of her younger sister prim, when her name was called during the reaping