Euthanasia can be classified in different ways, including:
active euthanasia - where a person deliberately intervenes to end someone's life
passive euthanasia - where a person causes death by withholding or withdrawing treatment that is necessary to maintain life
Euthanasia can also be classified as:
voluntary euthanasia - where a person makes a conscious decision to die and asks for help to do this
non-voluntary euthanasia - where a person is unable to give their consent and another person takes the decision on their behalf
involuntary euthanasia - where a person is killed against their expressed wishes
