The Kaddish or Qaddish (Aramaic: קדיש, qaddiš "holy"; alternative spellings: ḳaddish) is a hymn of praises to God found in Jewish prayer services. The central theme of the Kaddish is the magnification and sanctification of God's name. In the liturgy, different versions of the Kaddish are used functionally as separators between sections of the service.
The term "Kaddish" is often used to refer specifically to "The Mourner's Kaddish", said as part of the mourning rituals in Judaism in all prayer services, as well as at funerals (other than at the gravesite, see Qaddish aḥar Haqqəvurah "Qaddish after Burial") and memorials, and for 11 months after the death of a close relative. When mention is made of "saying Kaddish", this unambiguously refers to the rituals of mourning. Mourners say Kaddish to show that despite the loss they still praise God.
The opening words of this prayer are inspired by Ezekiel 38:23, a vision of God becoming great in the eyes of all the nations. The central line of the Kaddish in Jewish tradition is the congregation's response: יְהֵא שְׁמֵהּ רַבָּא מְבָרַךְ לְעָלַם וּלְעָלְמֵי עָלְמַיָּא (Yǝhē šmēh rabbā mǝvārakh lǝʿālam u-lʿalmē ʿālmayyā, "May His great name be blessed for ever, and to all eternity"), a public declaration of God's greatness and eternality. This response is an Aramaic translation of the Hebrew "ברוך שם כבוד מלכותו לעולם ועד" (Blessed be His name, whose glorious kingdom is forever), which is to be found in the Targum Pseudo-Jonathan (בריך שום יקריה לעלמי עלמין, Genesis 49:2 and Deuteronomy 6:4), and is similar to the wording of Daniel 2:20.