Yom Kippur, the holiest day of the year in Judaism, begins at sundown on Friday. Here's what the Jewish holiday honors and how it is celebrated.

Yom Kippur is the holiest day of the year in Judaism and follows Rosh Hashanah, the Jewish New Year. The name of the holiday translates from Hebrew to English as the Day of Atonement, and Jewish people may spend the day fasting, attending synagogue or observing the holiday in other ways. It follows Rosh Hashanah, the Jewish New Year.

Yom Kippur is part of the Jewish high holy days, but you shouldn't tell someone "Happy Yom Kippur." Here's what you need to know about the somber commemoration.