Saudi Arabia
The official language of Saudi Arabia is Arabic. The three main regional variants spoken by Saudis are Hejazi Arabic (about 6 million speakers), Najdi Arabic (about 8 million speakers), and Gulf Arabic (about 0.2 million speakers). Saudi Sign Language is the principal language of the deaf community. The large expatriate communities also speak their own languages, the most numerous of which are Tagalog (700,000), Rohingya (400,000), Urdu (380,000), Egyptian Arabic (300,000), and Indonesian (250,000).
Arabic
"Arabic" usually designates one of three main variants: Classical Arabic, Modern Standard Arabic and "colloquial" or "dialectal" Arabic. Classical Arabic is the language found in the Quran, used from the period of Pre-Islamic Arabia to that of the Abbasid Caliphate. Theoretically, Classical Arabic is considered normative, according to the syntactic and grammatical norms laid down by classical grammarians (such as Sibawayh) and the vocabulary defined in classical dictionaries (such as the Lisān al-ʻArab). In practice, however, modern authors almost never write in pure Classical Arabic, instead using a literary language with its own grammatical norms and vocabulary, commonly known as Modern Standard Arabic (MSA).