known as Day of Atonement, is the holiest day of the year for the Jewish people. Its central themes are atonement and repentance. Jewish people traditionally observe this holy day with an approximate 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services.
It's ten days after the Jewish new year, which centers around spiritual cleanliness. Then, we have a ten-day span of trying to improve ourselves. Lastly, on Yom Kippur, the Book of Life is sealed, so we fast for last-minute atonement, so we don't need much breaks from prayer.