[1] It belongs to the southwestern group of the Iranian division of the Indo-European languages, albeit with heavy influence from Hebrew.

The Iranic Tat language is spoken by the Muslim Tats of Azerbaijan, a group to which the Mountain Jews were mistakenly considered to belong during the era of Soviet historiography though the languages probably originated in the same region of the Persian empire.

[6] The language is spoken by an estimated 101,000 people: In the early 20th century, Judeo-Tat used the Hebrew script.

Judeo-Tat is a Southwest Iranian language (as is modern Persian) and is much more closely related to (but not fully mutually intelligible with)[10] modern Persian than most other Iranian languages of the Caucasus (for example: Talysh, Ossetian, and Kurdish).

Classical Hebrew /w/ (ו‎) and /aː/ (kamatz), however, are typically pronounced as /v/ and /o/ respectively (similar to the Persian/Ashkenazi traditions, but unlike the Iraqi tradition, which retains /w/ and /aː/) Azerbaijani: Vowel harmony and many loan words Russian: Loanwords adopted after the Russian Empire's annexation of Daghestan and Azerbaijan Northeast Caucasian languages: /tʃuklæ/ "small" (probably the same origin as the medieval Caucasian city name "Sera-chuk" mentioned by Ibn Battuta, meaning "little Sera") Other common phonology/morphology changes from classical Persian/Arabic/Hebrew: Being a variety of the Tat language, Judeo-Tat itself can be divided into several dialects: The dialects of Oğuz (formerly Vartashen) and the now extinct Jewish community of Mücü have not been studied well and thus cannot be classified.