Persians are an ethnic group defined primarily by language and location. The Persian language, also known as Farsi, which linguists classify in the Indo-Iranian Branch of the Indo-European Language Family, had about 23 million speakers in Iran in 1986 and 6 million in Afghanistan the same year (Grimes 1988). It is the official language of Iran, and also the language of Iran's government bureaucracy, educational institutions, mass media, and literature.