Bedouin Arabic refers to a typological group of Arabic dialects historically linked to Bedouin tribes, that has spread among both nomadic and sedentary groups across the Arab World. The group of dialects originate from Arabian tribes in Najd and the Hejaz that have spread since the 10th century until modern day. Bedouin dialects vary by region and tribe, but they typically share a set of features which distinguish them from sedentary-type dialects in each region.
The term can be ambiguous, as it can refer to dialects of nomadic Bedouins, dialects of Bedouin-descended populations, or sedentary dialects that have been influenced by Bedouin dialects.
The similarities between Bedouin dialects are due to their historical contact with one another, due to rapid population movements that quickly erase linguistic diversity.