This book offers sociological and structural descriptions of language varieties used in over 2 dozen Jewish communities around the world, along with synthesizing and theoretical chapters. Language descriptions focus on historical development, contemporary use, regional and social variation, structural features, and Hebrew/Aramaic loanwords. The book covers commonly researched language varieties, like Yiddish, Judeo-Spanish, and Judeo-Arabic, as well as less commonly researched ones, like Judeo-Tat, Jewish Swedish, and Hebraized Amharic in Israel today.