Yom Kippur is the most important date in the Jewish calendar, and even Jews who don’t celebrate other Jewish holidays will mark this one. It is the holiest day in the year in Judaism, and falls on the 10th day of the month of Tishri.
Yom Kippur translates as Day of Atonement and it is a day for represented for repenting sins. Atonement on this day is between Man and God only. Sins against other people have to be dealt with separately, and so the day before Yom Kippur is often spend asking for and giving forgiveness, and being charitable.
Jews have to fast on this day, beginning at sunset on the day before, and ending at sunset on the day itself. A festive meal is held before sunset on the previous day so that everybody eats well before the fast begins. Children under the age of 9 are not allowed to fast, and nor are women who have just given birth. In addition to this, it is not permitted to work; to wash or to wear perfumes, lotions or deodorant; or to wear leather.
The day is spent in prayer at the synagogue, and there is a communal confession of sin. The Ark, where the Torah is kept, remains open throughout the service, so people have to stand for the whole service. White is worn to symbolise purity.