Euthanasia refers to the intentional ending of a life to relieve suffering. It is classified as active or passive, voluntary or non-voluntary, indirect or physician-assisted suicide. Active euthanasia involves using lethal drugs, while passive euthanasia means withholding treatment. Voluntary euthanasia occurs with consent, while non-voluntary applies to unconscious patients. The Netherlands legally allows euthanasia under certain conditions, while other countries like India prohibit it. The case of Nancy Cruzan established some rights around refusing life-sustaining treatment in the US. Supporters argue it relieves suffering, while opponents believe it devalues human life.