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All Souls' Day is a day of prayer for the dead, particularly but not exclusively one's relatives. In Western Christianity the annual celebration is now held on 2 November and is associated with All Saints' Day (1 November) and its vigil, Hallowe'en (31 October). In the liturgical books of the western Catholic Church (the Latin Church) it is called The Commemoration of All the Faithful Departed, and is celebrated annually on 2 November, even if this date falls on a Sunday. In Anglicanism it is called Commemoration of All Faithful Departed and is an optional celebration. In the Eastern Orthodox Church and the associated Eastern Catholic Churches, it is celebrated several times during the year and is not associated with the month of November.

Beliefs and practices associated with All Souls' Day vary widely among Christian churches and denominations.