Varieties of Arabic
There are many varieties of Arabic (also called dialects of Arabic or vernacular languages) in existence. Arabic is a Semitic language within the Afroasiatic family that originated on the Arabian Peninsula. It is classified as a macrolanguage comprising 30 modern varieties, including its standard form. The largest divisions occur between the spoken languages of different regions. Some varieties of Arabic in North Africa, for example, are not easily comprehensible to an Arabic speaker from the Levant or the Persian Gulf. Within these broad regions further and considerable geographic distinctions exist, within countries, across country borders, even between cities and villages.
Modern Standard Arabic
The sociolinguistic situation of Arabic in modern times provides a prime example of the linguistic phenomenon of diglossiathe use of two distinct varieties of the same language, usually in different social contexts. This diglossic situation facilitates code-switching in which a speaker switches back and forth between the two dialects of the language, sometimes even within the same sentence. People speak MSA as a third language if they speak other languages native to a country as their first language and colloquial Arabic dialects as their second language. Modern Standard Arabic is also spoken by people of Arab descent outside the Arab world when people of Arab descent speaking different dialects communicate to each other. As there is a prestige or standard dialect of vernacular Arabic, speakers of standard colloquial dialects code-switch between these particular dialects and MSA.