Arabic is widely taught in schools and universities and is used to varying degrees in workplaces, government and the media. Arabic, in its standard form, is the official language of 26 states, as well as the liturgical language of the religion of Islam, since the Quran and Hadith were written in Arabic.
Arabic has influenced many other languages around the globe throughout its history. Some of the most influenced languages are Persian, Turkish, Azeri, Armenian, Hindustani (Hindi and Urdu), Kashmiri, Kurdish, Bosnian, Kazakh, Bengali, Malay (Indonesian and Malaysian), Maldivian, Pashto, Punjabi, Spanish, Tagalog, Assamese, Sindhi, Odia and Hausa and some languages in parts of Africa. Conversely, Arabic has borrowed words from other languages, including Hebrew, Greek, Aramaic, and Persian in medieval times and languages such as English and French in modern times.
Even during Muhammad's lifetime, there were dialects of spoken Arabic. Muhammad spoke in the dialect of Mecca, in the western Arabian peninsula, and it was in this dialect that the Quran was written down. However, the dialects of the eastern Arabian peninsula were considered the most prestigious at the time, so the language of the Quran was ultimately converted to follow the eastern phonology. It is this phonology that underlies the modern pronunciation of Classical Arabic. The phonological differences between these two dialects account for some of the complexities of Arabic writing, most notably the writing of the glottal stop or hamzah (which was preserved in the eastern dialects but lost in western speech) and the use of alif maqsurah (representing a sound preserved in the western dialects but merged with a in eastern speech).
Within the non-peninsula varieties, the largest difference is between the non-Egyptian North African dialects (especially Moroccan Arabic) and the others. Moroccan Arabic in particular is hardly comprehensible to Arabic speakers east of Libya (although the converse is not true, in part due to the popularity of Egyptian films and other media).
Other changes may also have happened. Classical Arabic pronunciation is not thoroughly recorded and different reconstructions of the sound system of Proto-Semitic propose different phonetic values. One example is the emphatic consonants, which are pharyngealized in modern pronunciations but may have been velarized in the eighth century and glottalized in Proto-Semitic.
The Arabic alphabet derives from the Aramaic through Nabatean, to which it bears a loose resemblance like that of Coptic or Cyrillic scripts to Greek script. Traditionally, there were several differences between the Western (North African) and Middle Eastern versions of the alphabet×in particular, the fa'had a dot underneath and qaf a single dot above in the Maghreb, and the order of the letters was slightly different (at least when they were used as numerals).