Euthanasia means 'gentle and easy death'. The term is used to describe the deliberate ending of a person's life for compassionate reasons because they are suffering, eg from a painful or incurable disease.
Euthanasia is illegal in the UK. Euthanasia is punishable by law and can carry a maximum penalty of life imprisonment.
Assisted suicide is also illegal in the UK. It is punishable by law and can carry a penalty of up to 14 years' imprisonment.