Wahhabism is an Islamic doctrine and religious movement founded by Muhammad ibn Abd al-Wahhab. It has been variously described as "ultraconservative", "austere", "fundamentalist", or "puritan(ical)" as an Islamic "reform movement" to restore "pure monotheistic worship" (tawhid) by devotees; and as a "deviant sectarian movement" "vile sect" and a distortion of Islam by its opponents.