The Jewish “Mourners’ Kaddish” is said at all prayer services and certain other occasions. It takes the form of Kaddish Yehe Shelama Rabba, and is traditionally recited several times, most prominently at or towards the end of the service, after the Aleinu and/or closing Psalms and/or (on the Sabbath) Ani’im Zemirot. Following the death of a parent, child, spouse, or sibling it is customary to recite the Mourners’ Kaddish in the presence of a congregation daily for thirty days, or eleven months in the case of a parent, and then at every anniversary of the death. The “mourner” who says the Kaddish will be any person present at a service who has the obligation to recite Kaddish in accordance with these rules. (source)
Here is the text. There are obviously plenty of online videos about the Mourners’ Kaddish – here is one.
Thanks Sande Ramage for pointing me to the embedded video.
