Which optional prayer before Yom Kippur means 'the pure prayer'?

Which optional prayer before Yom Kippur means “the pure prayer”? Tefillah Zakkah.

Tefillah Zakkah is traditionally recited before Kol Nidrei, often after the final meal and before the Yom Kippur fast fully begins. Its Hebrew name means “pure prayer” or “purifying prayer.” The text focuses on remorse, forgiveness, and preparing the conscience for the Day of Atonement.

A distinctive feature is its declaration that the worshipper forgives people who have wronged them, while recognizing that serious financial or legal harm may still require restitution. It also asks God to forgive the worshipper in return. This makes Tefillah Zakkah a personal preparation rather than one of Yom Kippur’s central communal services.

It is easy to confuse it with Kol Nidrei, the dramatic Aramaic declaration concerning vows, or with Vidui, the formal confession of sins repeated during Yom Kippur services. Tefillah Zakkah is optional and is not observed in every community or prayer rite.