Liturgy
Requiem
Missa pro defunctis
What it is
A Requiem is a Mass for the dead (Missa pro defunctis), named from the introit Requiem aeternam dona eis, Domine—eternal rest grant unto them, O Lord. The Church offers the Sacrifice for the repose of the soul, not as a memorial lecture about the deceased. In the traditional rite the sequence Dies Irae names judgment and mercy without softening either.
What it is not
A Requiem is not a "celebration of life" that avoids death and judgment. It is not primarily therapy for the living—though consolation follows truth. It is not optional piety; praying for the dead is a work of mercy and a doctrine of the Communion of Saints.
How a Catholic encounters it
Attend funeral Masses. Have Masses said for the dead—family, enemies, the forgotten. On All Souls and throughout November, intensify that charity. Sing or read Dies Irae as a warning for yourself and a plea for them. Rest is asked because rest is not presumed.