During the Ten Days of Repentance between Rosh Hashanah and Yom Kippur, additional lines are inserted in the first, second, second to last, and last blessings of all Amidot.
Yom Kippur is over at sundown on the tenth day at nightfall but is 'confirmed' as concluded after the recitation of the Kaddish following the end of ne'ila ("closing") prayer and the shofar is sounded.
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