Hi dear I was absent ! Azeri is spoken in north western of Iran and Azerbaijan ( country) . Azaris or Turks who speak azari( turki) live throughout the Iran, during world war 1 and 2 many Azari people migrate to east and center of iran , they both persian and azei , they have a problem with pronunciation of "ق" letter (gh) they say "گ" ... They played a big role in Iran history , we are proud of Satar Khan and Bagher Khan who had fought against dictatorship of curl kingdom regime and ... about 100 years ago . At the end i should say that unfortunately Iranian make joke and send SMS joke which scoff them , almost all of impolite Iranians say Azari's manner is similar to donkey !. many people have believed that England issued this awful thing , because Azaris fought against colonialism . viva freedom and decorum

Azeri and Persian languages blong to two language system , Azeri blongs to Turkic language system ,and Persian is Farsi( Persian) language. There is a big grammar and vocabulary difference . I think that many native Persian speaker know Azari just because they live in the same area , they all are muslims , in history they have influenced each other on language , culture and religion . For more information : http://en.wikipedia.org/wiki/Azeri