Yom Kippur is also known as the Day of Atonement. It is the holiest day of the year in Judaism, with the purpose of the day being repentance and atonement. Traditionally, the holy day is observed by fasting and intensive prayer as well as services at the synagogue.
Recommended Resources
About Judaism: What Is Yom Kippur?
Explains what Yom Kippur is, why is is important, and what things are done to honor the holy day.
http://judaism.about.com/od/holidays/a/yomkippur.htm
Contains details about the observance of Yom Kippur, what it is, essays, questions and answers, and how to prepare for it.
http://www.chabad.org/holidays/JewishNewYear/template_cdo/aid/4687/jewish/Yom-Kippur.htm
Hebrew For Christians: Yum Kippur
Offers information about the holy day of Yom Kippur, its meaning, and the season of Teshuvah as we as how modern day Jews observe Yom Kippur, among other things.
http://www.hebrew4christians.com/Holidays/Fall_Holidays/Yom_Kippur/yom_kippur.html
