Yom Kippur starts Friday at sundown. Here's what to know about the Jewish holiday

Yom Kippur , the holiest day of the year in Judaism, begins at sundown on Friday.

The purpose of Yom Kippur, also known as the Day of Atonement, is to practice forgiving others and repentance for one’s sins against God. Yom Kippur concludes the “10 days of repentance” that began on Oct. 2 with Rosh Hashanah, the Jewish New Year .

Many Jewish people will attend services at synagogues or other congregations, reciting prayers and singing special songs. It is common for people to fast for 25 hours, not eating or drinking from the night Yom Kippur begins until the night it ends.

Here's what to know about Yom Kippur, including how it is celebrated, traditions around the holiday and common greetings.

What are common traditions during Yom Kippur?

Many Jewish families and communities will gather before Yom Kippur begins and after it ends to share festive meals to prepare for the beginning of their fast and break their fasts together.

Another important observance is the blowing of the shofar, or a curved ram’s horn. The shofar is sounded ceremonially to conclude Yom Kippur.

What do you say to someone on Yom Kippur?

"G’mar chatima tova” is the customary greeting on Yom Kippur. In English, it means “May you be sealed in the Book of Life.”

According to Jewish tradition, one's fate is decided on Rosh Hashanah and sealed on Yom Kippur.

When does Yom Kippur end?

Yom Kippur ends at nightfall on Monday, Oct. 12, 2024. It lasts one day.

This article originally appeared on Arizona Republic: Yom Kippur starts Friday at sundown. Here's what to know about the Jewish holiday