Yom HaShoah, also known as Holocaust Remembrance Day, is a Jewish holiday dedicated to remembering those who lost their lives during the Holocaust. Yom HaShoah was first observed in 1953 on the 27th day of the month Nisan. Some Orthodox Jews do not celebrate Yom HaShoah because Nisan is the month of Passover, considered a month of celebration. Because it is a fairly new holiday, there are not many universal customs for Yom HaShoah. Traditions vary from Synagogue to Synagogue. It is common for solemn ceremonies to be held during which candles are lit and the prayer of the departed (the Kaddish).