Wahhabism is a religious reform movement and doctrine associated with the teachings of Muhammad ibn Abd al-Wahhab. It has been variously described as "orthodox", "puritan(ical)"; and as an Islamic "reform movement" to restore "pure monotheistic worship" by devotees. The term Wahhabi(sm) is chiefly used by outsiders polemically and adherents reject its use, preferring to be called "Salafi", and view themselves as 'Muwahhid', to emphasize the principle of Tawhid. The term has also been described as a Sunniphobic slur. It adheres to the Athari theology.