Yom Kippur is the most sacred holiday for Jewish people. What do you say to friends and loved ones on Oct. 1? Here's traditions, greetings and wishes.

Yom Kippur is the most solemn of Jewish holidays, during which Jews seek to atone for their sins and achieve reconciliation with God, according to Britannica. It concludes the Ten Days of Repentance that begin with Rosh Hashanah, the New Year, on the first day of Tishri in the Jewish calendar.