Halloween is a common name for All Saints' Day, which is a religious festival in Christianity, including Catholicism. The date is November 1. Catholicism designates All Saints' Day as a Mass day, and on this day, unless there is an irresistible reason, all believers are required to attend Mass in churches to remember all the saints who have passed away and ascended to heaven, especially those famous saints in Catholic history. Following All Saints' Day is All Souls' Day on November 2, which commemorates the souls that have passed away but have not yet ascended to heaven. Believers will pray for their early ascension.

Halloween, which falls on October 31 each year, is a traditional Western holiday. Many people in Asian regions mistakenly refer to Halloween as All Saints' Day.

All Hallows' Eve originated from ancient times.CelticThe Celtic New Year festival is also a time for honoring the souls of the departed, avoiding the interference of evil spirits, and offering food to the ancestors and good spirits to pray for a safe and peaceful passage through the harsh winter. The night before (Halloween), children dress up in costumes and masks, and go door-to-door collecting candy.