The Kel Maleh Rachamim (translated to mean “God full of compassion”) is a remembrance prayer for the soul of the departed that is recited by a cantor at a Jewish funeral. Additionally, the prayer is recited during the walk up the grave of an individual who has passed away, on days of remembrance for the deceased, and various other occasions or days during which the deceased is mourned, such as his or her death anniversary (Yahrzeit). http://www.shiva.com/learning-center/prayers/kel-maleh-rachamim/