Arabized Berber denotes an inhabitant of the Maghreb region in northwestern Africa, whose native language is a local dialect of Arabic and whose origins are mainly Berber.
The expression holds that most populations in North Africa are of Berber heritage, including those inhabiting Morocco, Algeria, Tunisia, Libya, Western Sahara, and Mauritania. The widespread language shift from Berber to Arabic happened, at least partially, due to the privileged status that the Arabic language has generally been given in the states of North Africa, from the Arab conquest in 652 up until the European conquest in the twentieth century, as well as the migration of the Banu Hilal and Banu Sulaym tribes to North Africa.
Medieval Arabic sources frequently refer to North Africa (excluding Egypt) as Bilad Al Barbar or 'Land of the Berbers' (Arabic: بلادالبربر) prior to the Muslim conquest of the Maghreb. This designation may have given rise to the term Barbary Coast which was used by Europeans until the 19th century to refer to coastal Northwest Africa. But the cultural impact of Islam was big as it was the only boost for the spread of the Arabic language.
Since the populations were partially affiliated with the Arab Muslim culture, North Africa was starting to be referred to by the Arabic speakers as Al-Maġrib (meaning "The West") since it was considered as the western part of the known world. For historical references, medieval Arab and Muslim historians and geographers used to refer to Morocco as Al-Maghrib al Aqşá ("The Farthest West"), disambiguating it from neighboring historical regions called Al-Maghrib al Awsat ("The Middle West", Algeria) and Al-Maghrib al Adna ("The Nearest West", Tunisia).