Euthanasia refers to the painless killing of a patient suffering from an incurable disease or condition. It aims to prevent prolonged suffering and can be voluntary, non-voluntary, or involuntary. It is currently legal in some locations like the Netherlands, Belgium, Luxembourg, Oregon, Washington, and Montana under certain conditions like being terminally ill with less than six months to live. While it remains controversial, proponents argue that as humans we should be able to choose how we die if incurably ill just as we can choose how to live.