Euthanasia refers to the practice of intentionally ending a life to relieve suffering. It can be voluntary, non-voluntary, or involuntary. Voluntary euthanasia occurs when a mentally competent patient explicitly consents to die. Non-voluntary euthanasia happens when a patient is unable to consent. Involuntary euthanasia is performed without the patient's knowledge or consent. Euthanasia can also be active, such as with a lethal injection, or passive, such as removing life support. The legality and ethics of euthanasia are controversial, with some arguing it should be legal to allow patient autonomy, while others believe it violates the sanctity of life or could be abused