There are two main types of written Arabic: Classical Arabic - the language of the Qur'an and classical literature. It differs from Modern Standard Arabic mainly in style and vocabulary, some of which is archaic. All Muslims are expected to recite the Qur'an in the original language, however many rely on translations in order to understand the text. Modern Standard Arabic - the universal language of the Arabic-speaking world which is understood by all Arabic speakers. It is the language of the vast majority of written material and of formal TV shows, lectures, etc. Each Arabic speaking country or region also has its own variety of colloquial spoken Arabic. These colloquial varieties of Arabic appear in written form in some poetry, cartoons and comics, plays and personal letters. There are also translations of the bible into most varieties of colloquial Arabic. http://www.omniglot.com/writing/arabic.htm

Modern Standard Arabic ( MSA) ( fusha ) is used in written Arabic and you can hear it in news . if you are learning Arabic , it will be the best to learn MSA , so everyone can understand you and vice versa . Khaliji dialect contains many phrases and words that are already in (MSA) more that Egyptian and Sham's ( spoken in Lebenan , Syria ..etc) dialects . It is not hard to understand Khaliji , Egyptian and Shami dialect , yet it is hard to understand Tunisian , Algerian dialects .

MSA Modern Standard Arabic, is the written Arabic used for all official documents. We learn it in school, we read and write in it. Classical Arabic is the same thing but the more eloquent, older version of the language, it was used to write poetry, religious texts. As for which dialect you should learn Arabic in, learn it in a dialect that the rest of the Arab world understands which is either Egyptian or Levantine (Shami) Arabic because these are the two most popular and well understood dialects. Khaliji, on the other side, is only understood by khaliji people, or by people close to those countries, not all of the Arab world. Along with a spoken dialect of Arabic, though, you'd have to learn MSA if you want to understand newspapers, modern writings, etc.

http://ar.wikipedia.org/wiki/%D9%84%D8%BA%D8%A9_%D8%B9%D8%B1%D8%A8%D9%8A%D8%A9 http://www.arabworldbooks.com/ArabicLiterature/Colloquial.htm Abu al-Aswad Al-Du'ali (Arabic: أبو الأسود الدؤلي‎) (c.603–688) was a close companion of Imam Ali and grammarian. he was the first to place dots on the Arabic Words and the first to write on Arabic linguistics[1], he educated many students[2]. I recommend you to learn the formal Arabic language that used in education instituts and most media , but if you insist to learn an informal ,I recommend the Egyptian accent because it most famous..?!

la langue arabe c'est la langue origine du coran .et pour les autre langue sont des accent Arabic is the language of the original Koran. and for other languages are accents