Yom Kippur is often considered the holiest day of the Jewish year. This day of fasting, prayer, and introspection begins with Kol Nidre, a prayer that asks for absolution from vows, and ends with the Neilah prayer. In between is a liturgy that runs the emotional gamut, from the solemn to the celebratory.
The culmination of the Yamin Noraim (Days of Awe) is the fast day of Yom Kippur (The Day of Atonement). This is the day at the conclusion of which, according to tradition, God seals the Books of Life and Death for the coming year. The day is devoted to communal repentance for sins committed over the course of the previous year. Because of the nature of Yom Kippur and its associated rituals, it is the most solemn day in the Jewish calendar.

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