Yiddish is a language used by some Jews. At first, it was a dialect of German that Jews began to use in Europe about 1000 years ago. It was and still is used in the United States, especially in New York City, and other countries that now have Jews.
Most Yiddish words come from German, but many words are also from Hebrew and Slavic languages, especially Polish, and some from French, Hungarian and Latin. Yiddish is written usually by the Hebrew alphabet.