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Yom Kippur, also known as Day of Atonement, is probably the most important holiday of the Jewish year. Its central themes are atonement and repentance. Jewish people traditionally observe this holy day with a 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services. Yom Kippur completes the annual period known in Judaism as the High Holy Days or Yamim Nora’im (“Days of Awe”).