Yom Kippur means a " day of atonement " in Judaism is the most sacred holy day falling on the 10th day of the Jewish Month of Tishri (usually late September or early October). Based on the Gregorian calendar.
On the dau of Yom Kippur, Jews who do not observe any other Jewish custom will refrain from work, fast and/or attend synagogue services
Observed as a day of fasting and prayer for forgiveness for sins committed during the past year. Jews gather in synagogues on the Eve of Yom Kippur, when the fast begins, and return the following morning to continue confessing, doing penance, and praying for forgiveness.
Yom Kippur is a day set aside to "afflict the soul," to atone for the sins of the past year. This day is, essentially, ones' last appeal or chance to change the judgment, to demonstrate your repentance and make amends. Jewish people usually most part of this festival in the synagogues taking part in services of worship and prayers