I never had a Jewish education. I want to know what Yom Kippur is without having to read an encyclopedia. I'd appreciate hearing what Yom Kippur is in 25 words or less.
AskTheRabbi.org answered:
Yom Kippur means "Day of Atonement". We fast and think about what we’ve done wrong. God promises to forgive us if we resolve to improve. (See Levicticus 23:26-32)