Question: what are yom tov holidays?
Answer: Yom tov sheni shel galuyot (Hebrew: יום טוב שני של גלויות‎), also called in short yom tov sheni, means "the second festival day in the Diaspora", and is an important concept in halakha (Jewish law). The concept refers to the observance of an extra day of Jewish holidays outside of the Land of Israel.