The term 'Afghani Tongue' refers to the language of Pashtu, which is also known as Pashto. Pashtu is an Iranian language spoken by over 50 million people in Afghanistan and Pakistan. It is the official language of Afghanistan and one of the two official languages of Pakistan. Pashtu is written in the Perso-Arabic script and is closely related to other Iranian languages such as Persian, Dari, and Tajik.