OK
It is recited for the deceased in the eleven months after his death, and on the anniversary of his death thereafter.
What means this?
Is this any different than saying a Mass (a prayer praising God) on the anniversary of a person's death, "for" him?
SD
The Kaddish is not a prayer requesting anything for the behalf of the deceased. Rather, it represents the acceptance of God's will even in the face of loss, and continued relationship with the community despite the grief of the bereaved. It is equivalent to praying "the Lord giveth, and the Lord taketh away. Blessed be the Name of the Lord".