Yom Kippur

Gemar Chasimah Tovah!

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Here is "Yom Kippur in a Nutshell" from chabad.org:

Yom Kippur is the holiest day of the year--the day on which we are closest to G‑d and to the quintessence  of our own souls. It is the Day of Atonement -- "For on this day He will forgive you, to purify you, that you be cleansed from all your sins before G‑d" (Leviticus 16:30).

For twenty-six hours--from several minutes before sunset on Tishrei 9 to after nightfall on Tishrei 10--we "afflict our souls": we abstain from food and drink, do not wash or anoint our bodies, do not wear leather shoes, and abstain from marital relations.

Before Yom Kippur we perform the Kaparot atonement service; we request and receive honey cake, in acknowledgement that we are all recipients in G-d's world and in prayerful hope for a sweet and abundant year; eat a festive meal, immerse in a mikvah, and give extra charity. Late afternoon we eat the pre-fast meal, following which we bless our children, light a memorial candle as well as the holiday candles, and go to the synagogue for Kol Nidrei services.

In the course of Yom Kippur we hold five prayer services: Maariv, with its solemn Kol Nidrei service, on the eve of Yom Kippur; Shacharit--the morning prayer; Musaf, which includes a detailed account of the Yom Kippur Temple service; Minchah, which includes the reading of the Book of Jonah; and Ne'illah, the "closing of the gates" service at sunset. We say the Al Chet confession of sins eight times in the course of Yom Kippur, and recite Psalms every available moment.

The day is the most solemn of the year, yet an undertone of joy suffuses it: a joy that revels in the spirituality of the day and expresses the confidence that G-d will accept our repentance, forgive our sins, and seal our verdict for a year of life, health and happiness. When the closing Ne'illah service climaxes in the resounding cries of "Hear O Israel... G-d is one" and a single blast of the shofar, followed by the proclamation, "Next year in Jerusalem." Then joy erupts in song and dance (a Chabad custom is to sing the lively "Napoleon's March"), followed by the festive after-fast meal, making the evening after Yom Kippur a Yom Tov (festival) in its own right.