When is an Arab not an Arab?

For many people, the idea of an Arab comes straight out of the movies. Lawrence of Arabia, riding a camel across a sand dunes, face wrapped in a light colored scarf. Wikipedia says Arabs inhabit the Arab world in North Africa, Western Asia, the Horn of Africa and the western Indian Oceans. For most of us on the outside the Arabic-speaking world, anyone who speaks Arabic and is Muslim by default is probably an Arab.

Source: https://en.wikipedia.org/wiki/Lawrence_of_Arabia_%28film%29#/media/File:Lawrence_of_arabia_ver3_xxlg.jpg