Arabic ( or ) is a name applied to the descendants of the Classical Arabic language of the 6th century CE. This includes both the literary language (Modern Standard Arabic or Literary Arabic, used in most written documents as well as in formal spoken occasions, such as lectures and radio broadcasts) and the spoken Arabic varieties, spoken in a wide arc of territory stretching across the Middle East and North Africa. Arabic is a Central Semitic language, most closely related to Hebrew, Aramaic, Ugaritic and Phoenician. Written Arabic is distinct from and more conservative than all of the spoken varieties, and the two exist in a state known as diglossia, used side-by-side for different societal functions.