The Talmud states, "Yom Kippur atones for those who repent and does not atone for those who do not repent". Repentance in Judaism is done through a process called Teshuva, which in its most basic form consists of regretting having committed the sin, resolving not to commit that sin in the future and to confess that sin before God. Confession in Judaism is called Vidui (Hebrew וידוי). There is also a commandment to repent on Yom Kippur. Accordingly, Yom Kippur is unique for the confessional, or Vidui, that is part of the prayer services. In keeping with the requirement to repent on Yom Kippur, Jews recite the full Vidui a total of 9 times: once during Mincha on Yom Kippur eve, and on Yom Kippur itself during Ma'ariv (2 times), Shacharit (2 times), Musaf (2 times), and Mincha (2 times); at Ne’eilah, only the short confessional is said. The first time in each service takes place during the personal recitation of the Amidah (standing, silent prayer), and the second time during the cantor's repetition of the Amidah (except during the preceding Mincha), in a public recitation.
All holidays begin at sundown on the evening before the date specified in the tables below. For example, if the dates for Rosh Hashana were listed as Oct 3 - 4 , then the holiday begins at sundown on Oct 2 and ends at nightfall on Oct 4 .