Final answer:
On erev Yom Kippur, there is a special mitzvah called Kol Nidre, which is a prayer recited at the beginning of the evening service. Kol Nidre nullifies any unintentional vows or promises made throughout the year, allowing individuals to start the holiday with a clean slate.
Step-by-step explanation:
On erev Yom Kippur, there is a special mitzvah called Kol Nidre. Kol Nidre is a prayer that is recited at the beginning of the evening service on Yom Kippur. It is a powerful and solemn prayer that nullifies any vows or promises that may have been made unintentionally throughout the year. By reciting Kol Nidre, people can start the holiday with a clean slate and focus on repentance and forgiveness.