All Souls Day Requiem Latin Mass - Catholic Stock Photo

All Souls' Day, also known as the Commemoration of All the Faithful Departed and the Day of the Dead, is a day of prayer and remembrance for the souls of those who have died, which is observed by Roman Catholics annually on November 2. Source

A Requiem Mass, also known as Mass for the dead is a Mass offered for the repose of the soul or souls of one or more deceased persons, using a particular form of the Roman Missal. It is usually, but not necessarily, celebrated in the context of a funeral. Source