What is "judeo-persian"

Judæo-Persian, or Jidi (; also spelled Dzhidi or Djudi), refers to both a group of Jewish dialects spoken by the Jews living in Iran and Judæo-Persian texts (written in Hebrew alphabet). As a collective term, Dzhidi refers to a number of Judæo-Iranian languages spoken by Jewish communities throughout the formerly extensive Persian Empire. On a more limited scale, Dzhidi refers to the Judæo-Persian dialect spoken by the Jewish communities of the area around Tehran and Mashhad.