There are three modern varieties of standard Persian:
- Western Persian (Persian, Iranian Persian, or Farsi) is spoken in Iran, and by minorities in Iraq and the Persian Gulf states.
- Eastern Persian (Dari Persian, Afghan Persian, or Dari) is spoken in Afghanistan.
- Tajiki (Tajik Persian) is spoken in Tajikistan and Uzbekistan. It is written in the Cyrillic script.
All these three varieties are based on the classic Persian literature and its literary tradition. There are also several local dialects from Iran, Afghanistan and Tajikistan which slightly differ from the standard Persian. Hazaragi (in Central Afghanistan and Pakistan), Herati (in Western Afghanistan), Darwazi (in Afghanistan and Tajikistan), Tehrani (in Iran) and Dehwari (in Pakistan) are examples of these dialects. Persian-speaking peoples of Iran, Afghanistan, and Tajikistan can understand one another with a relatively high degree of mutual intelligibility, give or take minor differences in vocabulary, pronunciation, and grammar – much in the same relationship as shared between British and American English.