Yom Kippur is a Jewish holiday I knew little about,  but my son’s elementary school got off in order to observe the holiday. While I scrambled to rearrange my schedule so I could be with my son I decided to learn more about this fantastic holiday. Yom Kippur is the holiest of all Jewish holidays.  It’s communal repentance for sins committed over the previous year. It’s a day of abstinence from all kinds of things like food, sexual relations and leather shoes.