There is not one standard or legal definition of humanitarian intervention; the field of analysis (such as law, ethics or politics) often influences the definition that is chosen. Differences in definition include variations in whether humanitarian intervention is limited to instances where there is an absence of consent from the host state; whether humanitarian intervention is limited to punishment actions; and whether humanitarian intervention is limited to cases where there has been explicit UN Security Council authorization for action. There is, however, a general consensus on some of its essential characteristics: