Farsi

Also known as Parsi, or Persian. The main, and official language in Iran, and Afghanistan. (Persian Farsi, Afghan Farsi.) The Farsi in both countries are stlightly different. But if a true Persian and a true Afghan meet for the first time, they will understand each other. Basically it's like comparing the American English to the British English. It is one of the oldest languages still in use today. It is an ancient Indo-European language.