Reparation, in a judicial context, is compensation and punishment for a claimed loss by a claimed criminal to a claimed victim. Monetary payment is a common form.
Aside from reparations between individuals, reparation demands may also be made on entire groups, regardless of individual guilt, arguably representing a form of collective punishment. Demands for reparations may even be made on all the descendants of a group that earlier, possibly many hundreds of years earlier, included some individuals who allegedly committed a crime.
War victors have often demanded various things from the defeated, often claiming that this is justified as reparations, such as due to the defeated supposedly being guilty of having started the war.