Yom Kippur is one of the most widely observed holidays on the Jewish calendar, The major theme of Yom Kippur, as its name implies, is atonement. Yom Kippur is celebrated, according to Scripture, on the tenth day of the Hebrew month, Tishri - ten days after Rosh Hashanah. The custom becomes more and more intense, and reaches a peak on the 10 days between Rosh Hashanah and Yom Kippur, known as the "Yamim Nora'im" ("The Days of Awe").
Yom Kippur in 2016 is on Wednesday, the 12th of October.