Actually, is's not - but it is nevertheless very, very important (it's definitely the second most important) as it's the day when observant Jews believe G-d takes a long, hard look at how they have behaved over the last year and what they have done during the ten days since Rosh Hashanah to put right any sins or wrongs committed. If a person has truly tried to make amends, they can consider themselves absolved with G-d. This is considered so important that there are many Jewish people who don't attend a synagogue on any other day but always make it for the Yom Kippur services.
The most important is Shabbat, which of course falls weekly, as it commemorates G-d's creation of the Universe and provides an escape from everyday labours and time to spend with that most important concept among Jewish people, the family.
The Day of Atonement is Yom Kippur (Leviticus ch.23). This is the holiest day in Judaism and the day where even secular Jews attend synagogue. On Yom Kippur, Jewish people fast from all food and drinks for a complete 25hrs, starting just before sunset the previous day.
The pronounciation of yom kippur is yum-kipp-her.
Yom Kippur
Jewish Mexicans do Yom Kippur.
Yom Kippur is not a person or a country, it is a holiday. The Egyptians chose to invade Israel on Yom Kippur because of its solemnity. They expected the Israelis to be unprepared on Yom Kippur, which was indeed the case.
First, we want to make sure that you don't think that Yom Kippur is a month. Yom Kippur is a single day, in the Hebrew month of Tishrei. Elul (אלול) is the month preceding Tishrei and all the days in it, including Yom Kippur.
Yom Kippur is from the Torah (Leviticus ch.23).
Yom Kippur literally means "Day of Atonement".
Jewish Mexicans celebrate Yom Kippur.
Jews in California celebrate Yom Kippur the same way that Jews the world over celebrate Yom Kippur.
The synagogue is the Jewish place of worship, and Yom Kippur is celebrated there.
Yom kippur is the Hebrew day of atonement and it is a worldwide event.